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Implement 4 new aggregate functions from SQL2003. Specifically: var_pop(),
var_samp(), stddev_pop(), and stddev_samp(). var_samp() and stddev_samp() are just renamings of the historical Postgres aggregates variance() and stddev() -- the latter names have been kept for backward compatibility. This patch includes updates for the documentation and regression tests. The catversion has been bumped. NB: SQL2003 requires that DISTINCT not be specified for any of these aggregates. Per discussion on -patches, I have NOT implemented this restriction: if the user asks for stddev(DISTINCT x), presumably they know what they are doing.
This commit is contained in:
Neil Conway
parent
ab812ef326
commit
0ebf1cc834
@ -1,4 +1,4 @@
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<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.312 2006/03/10 19:10:47 momjian Exp $ -->
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<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.313 2006/03/10 20:15:25 neilc Exp $ -->
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<chapter id="functions">
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<title>Functions and Operators</title>
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@ -7914,6 +7914,46 @@ SELECT NULLIF(value, '(none)') ...
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<type>double precision</type> for floating-point arguments,
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otherwise <type>numeric</type>
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</entry>
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<entry>historical alias for <function>stddev_samp</function></entry>
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</row>
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<row>
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<entry>
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<indexterm>
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<primary>standard deviation</primary>
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<secondary>population</secondary>
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</indexterm>
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<function>stddev_pop(<replaceable class="parameter">expression</replaceable>)</function>
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</entry>
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<entry>
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<type>smallint</type>, <type>int</type>,
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<type>bigint</type>, <type>real</type>, <type>double
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precision</type>, or <type>numeric</type>
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</entry>
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<entry>
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<type>double precision</type> for floating-point arguments,
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otherwise <type>numeric</type>
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</entry>
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<entry>population standard deviation of the input values</entry>
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</row>
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<row>
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<entry>
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<indexterm>
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<primary>standard deviation</primary>
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<secondary>sample</secondary>
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</indexterm>
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<function>stddev_samp(<replaceable class="parameter">expression</replaceable>)</function>
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</entry>
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<entry>
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<type>smallint</type>, <type>int</type>,
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<type>bigint</type>, <type>real</type>, <type>double
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precision</type>, or <type>numeric</type>
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</entry>
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<entry>
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<type>double precision</type> for floating-point arguments,
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otherwise <type>numeric</type>
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</entry>
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<entry>sample standard deviation of the input values</entry>
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</row>
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@ -7951,9 +7991,48 @@ SELECT NULLIF(value, '(none)') ...
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<type>double precision</type> for floating-point arguments,
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otherwise <type>numeric</type>
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</entry>
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<entry>sample variance of the input values (square of the sample standard deviation)</entry>
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<entry>historical alias for <function>var_samp</function></entry>
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</row>
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<row>
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<entry>
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<indexterm>
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<primary>variance</primary>
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<secondary>population</secondary>
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</indexterm>
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<function>var_pop</function>(<replaceable class="parameter">expression</replaceable>)
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</entry>
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<entry>
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<type>smallint</type>, <type>int</type>,
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<type>bigint</type>, <type>real</type>, <type>double
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precision</type>, or <type>numeric</type>
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</entry>
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<entry>
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<type>double precision</type> for floating-point arguments,
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otherwise <type>numeric</type>
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</entry>
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<entry>population variance of the input values (square of the population standard deviation)</entry>
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</row>
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<row>
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<entry>
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<indexterm>
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<primary>variance</primary>
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<secondary>sample</secondary>
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</indexterm>
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<function>var_samp</function>(<replaceable class="parameter">expression</replaceable>)
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</entry>
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<entry>
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<type>smallint</type>, <type>int</type>,
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<type>bigint</type>, <type>real</type>, <type>double
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precision</type>, or <type>numeric</type>
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</entry>
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<entry>
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<type>double precision</type> for floating-point arguments,
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otherwise <type>numeric</type>
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</entry>
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<entry>sample variance of the input values (square of the sample standard deviation)</entry>
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</row>
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</tbody>
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</tgroup>
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</table>
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.121 2006/03/05 15:58:41 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.122 2006/03/10 20:15:25 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -1861,11 +1861,13 @@ setseed(PG_FUNCTION_ARGS)
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* FLOAT AGGREGATE OPERATORS
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* =========================
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*
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* float8_accum - accumulate for AVG(), STDDEV(), etc
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* float4_accum - same, but input data is float4
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* float8_avg - produce final result for float AVG()
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* float8_variance - produce final result for float VARIANCE()
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* float8_stddev - produce final result for float STDDEV()
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* float8_accum - accumulate for AVG(), variance aggregates, etc.
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* float4_accum - same, but input data is float4
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* float8_avg - produce final result for float AVG()
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* float8_var_samp - produce final result for float VAR_SAMP()
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* float8_var_pop - produce final result for float VAR_POP()
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* float8_stddev_samp - produce final result for float STDDEV_SAMP()
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* float8_stddev_pop - produce final result for float STDDEV_POP()
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*
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* The transition datatype for all these aggregates is a 3-element array
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* of float8, holding the values N, sum(X), sum(X*X) in that order.
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@ -2015,7 +2017,7 @@ float8_avg(PG_FUNCTION_ARGS)
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}
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Datum
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float8_variance(PG_FUNCTION_ARGS)
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float8_var_pop(PG_FUNCTION_ARGS)
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{
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ArrayType *transarray = PG_GETARG_ARRAYTYPE_P(0);
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float8 *transvalues;
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@ -2024,7 +2026,35 @@ float8_variance(PG_FUNCTION_ARGS)
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sumX2,
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numerator;
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transvalues = check_float8_array(transarray, "float8_variance");
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transvalues = check_float8_array(transarray, "float8_var_pop");
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N = transvalues[0];
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sumX = transvalues[1];
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sumX2 = transvalues[2];
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/* Population variance is undefined when N is 0, so return NULL */
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if (N == 0.0)
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PG_RETURN_NULL();
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numerator = N * sumX2 - sumX * sumX;
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/* Watch out for roundoff error producing a negative numerator */
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if (numerator <= 0.0)
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PG_RETURN_FLOAT8(0.0);
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PG_RETURN_FLOAT8(numerator / (N * N));
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}
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Datum
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float8_var_samp(PG_FUNCTION_ARGS)
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{
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ArrayType *transarray = PG_GETARG_ARRAYTYPE_P(0);
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float8 *transvalues;
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float8 N,
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sumX,
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sumX2,
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numerator;
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transvalues = check_float8_array(transarray, "float8_var_samp");
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N = transvalues[0];
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sumX = transvalues[1];
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sumX2 = transvalues[2];
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@ -2043,7 +2073,7 @@ float8_variance(PG_FUNCTION_ARGS)
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}
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Datum
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float8_stddev(PG_FUNCTION_ARGS)
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float8_stddev_pop(PG_FUNCTION_ARGS)
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{
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ArrayType *transarray = PG_GETARG_ARRAYTYPE_P(0);
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float8 *transvalues;
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@ -2052,7 +2082,35 @@ float8_stddev(PG_FUNCTION_ARGS)
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sumX2,
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numerator;
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transvalues = check_float8_array(transarray, "float8_stddev");
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transvalues = check_float8_array(transarray, "float8_stddev_pop");
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N = transvalues[0];
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sumX = transvalues[1];
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sumX2 = transvalues[2];
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/* Population stddev is undefined when N is 0, so return NULL */
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if (N == 0.0)
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PG_RETURN_NULL();
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numerator = N * sumX2 - sumX * sumX;
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/* Watch out for roundoff error producing a negative numerator */
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if (numerator <= 0.0)
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PG_RETURN_FLOAT8(0.0);
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PG_RETURN_FLOAT8(sqrt(numerator / (N * N)));
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}
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Datum
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float8_stddev_samp(PG_FUNCTION_ARGS)
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{
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ArrayType *transarray = PG_GETARG_ARRAYTYPE_P(0);
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float8 *transvalues;
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float8 N,
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sumX,
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sumX2,
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numerator;
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transvalues = check_float8_array(transarray, "float8_stddev_samp");
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N = transvalues[0];
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sumX = transvalues[1];
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sumX2 = transvalues[2];
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@ -14,7 +14,7 @@
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* Copyright (c) 1998-2006, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.92 2006/03/05 15:58:43 momjian Exp $
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* $PostgreSQL: pgsql/src/backend/utils/adt/numeric.c,v 1.93 2006/03/10 20:15:26 neilc Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -2181,10 +2181,22 @@ numeric_avg(PG_FUNCTION_ARGS)
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NumericGetDatum(N)));
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}
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Datum
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numeric_variance(PG_FUNCTION_ARGS)
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/*
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* Workhorse routine for the standard deviance and variance
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* aggregates. 'transarray' is the aggregate's transition
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* array. 'variance' specifies whether we should calculate the
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* variance or the standard deviation. 'sample' indicates whether the
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* caller is interested in the sample or the population
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* variance/stddev.
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*
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* If appropriate variance statistic is undefined for the input,
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* *is_null is set to true and NULL is returned.
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*/
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static Numeric
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numeric_stddev_internal(ArrayType *transarray,
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bool variance, bool sample,
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bool *is_null)
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{
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ArrayType *transarray = PG_GETARG_ARRAYTYPE_P(0);
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Datum *transdatums;
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int ndatums;
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Numeric N,
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@ -2195,8 +2207,11 @@ numeric_variance(PG_FUNCTION_ARGS)
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vsumX,
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vsumX2,
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vNminus1;
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NumericVar *comp;
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int rscale;
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*is_null = false;
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/* We assume the input is array of numeric */
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deconstruct_array(transarray,
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NUMERICOID, -1, false, 'i',
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@ -2208,16 +2223,26 @@ numeric_variance(PG_FUNCTION_ARGS)
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sumX2 = DatumGetNumeric(transdatums[2]);
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if (NUMERIC_IS_NAN(N) || NUMERIC_IS_NAN(sumX) || NUMERIC_IS_NAN(sumX2))
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PG_RETURN_NUMERIC(make_result(&const_nan));
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return make_result(&const_nan);
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/* Sample variance is undefined when N is 0 or 1, so return NULL */
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init_var(&vN);
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set_var_from_num(N, &vN);
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if (cmp_var(&vN, &const_one) <= 0)
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/*
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* Sample stddev and variance are undefined when N <= 1;
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* population stddev is undefined when N == 0. Return NULL in
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* either case.
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*/
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if (sample)
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comp = &const_one;
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else
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comp = &const_zero;
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if (cmp_var(&vN, comp) <= 0)
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{
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free_var(&vN);
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PG_RETURN_NULL();
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*is_null = true;
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return NULL;
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}
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init_var(&vNminus1);
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@ -2233,7 +2258,7 @@ numeric_variance(PG_FUNCTION_ARGS)
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mul_var(&vsumX, &vsumX, &vsumX, rscale); /* vsumX = sumX * sumX */
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mul_var(&vN, &vsumX2, &vsumX2, rscale); /* vsumX2 = N * sumX2 */
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sub_var(&vsumX2, &vsumX, &vsumX2); /* N * sumX2 - sumX * sumX */
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sub_var(&vsumX2, &vsumX, &vsumX2); /* N * sumX2 - sumX * sumX */
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if (cmp_var(&vsumX2, &const_zero) <= 0)
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{
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@ -2242,9 +2267,11 @@ numeric_variance(PG_FUNCTION_ARGS)
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}
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else
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{
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mul_var(&vN, &vNminus1, &vNminus1, 0); /* N * (N - 1) */
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mul_var(&vN, &vNminus1, &vNminus1, 0); /* N * (N - 1) */
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rscale = select_div_scale(&vsumX2, &vNminus1);
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div_var(&vsumX2, &vNminus1, &vsumX, rscale, true); /* variance */
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div_var(&vsumX2, &vNminus1, &vsumX, rscale, true); /* variance */
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if (!variance)
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sqrt_var(&vsumX, &vsumX, rscale); /* stddev */
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res = make_result(&vsumX);
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}
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@ -2254,86 +2281,68 @@ numeric_variance(PG_FUNCTION_ARGS)
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free_var(&vsumX);
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free_var(&vsumX2);
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PG_RETURN_NUMERIC(res);
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return res;
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}
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Datum
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numeric_stddev(PG_FUNCTION_ARGS)
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numeric_var_samp(PG_FUNCTION_ARGS)
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{
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ArrayType *transarray = PG_GETARG_ARRAYTYPE_P(0);
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Datum *transdatums;
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int ndatums;
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Numeric N,
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sumX,
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sumX2,
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res;
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NumericVar vN,
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vsumX,
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vsumX2,
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vNminus1;
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int rscale;
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Numeric res;
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bool is_null;
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/* We assume the input is array of numeric */
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deconstruct_array(transarray,
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NUMERICOID, -1, false, 'i',
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&transdatums, NULL, &ndatums);
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if (ndatums != 3)
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elog(ERROR, "expected 3-element numeric array");
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N = DatumGetNumeric(transdatums[0]);
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sumX = DatumGetNumeric(transdatums[1]);
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sumX2 = DatumGetNumeric(transdatums[2]);
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res = numeric_stddev_internal(PG_GETARG_ARRAYTYPE_P(0),
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true, true, &is_null);
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if (NUMERIC_IS_NAN(N) || NUMERIC_IS_NAN(sumX) || NUMERIC_IS_NAN(sumX2))
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PG_RETURN_NUMERIC(make_result(&const_nan));
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/* Sample stddev is undefined when N is 0 or 1, so return NULL */
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init_var(&vN);
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set_var_from_num(N, &vN);
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if (cmp_var(&vN, &const_one) <= 0)
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{
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free_var(&vN);
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if (is_null)
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PG_RETURN_NULL();
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}
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init_var(&vNminus1);
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sub_var(&vN, &const_one, &vNminus1);
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init_var(&vsumX);
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set_var_from_num(sumX, &vsumX);
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init_var(&vsumX2);
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set_var_from_num(sumX2, &vsumX2);
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/* compute rscale for mul_var calls */
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rscale = vsumX.dscale * 2;
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mul_var(&vsumX, &vsumX, &vsumX, rscale); /* vsumX = sumX * sumX */
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mul_var(&vN, &vsumX2, &vsumX2, rscale); /* vsumX2 = N * sumX2 */
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sub_var(&vsumX2, &vsumX, &vsumX2); /* N * sumX2 - sumX * sumX */
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if (cmp_var(&vsumX2, &const_zero) <= 0)
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{
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/* Watch out for roundoff error producing a negative numerator */
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res = make_result(&const_zero);
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}
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else
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{
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mul_var(&vN, &vNminus1, &vNminus1, 0); /* N * (N - 1) */
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rscale = select_div_scale(&vsumX2, &vNminus1);
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div_var(&vsumX2, &vNminus1, &vsumX, rscale, true); /* variance */
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sqrt_var(&vsumX, &vsumX, rscale); /* stddev */
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res = make_result(&vsumX);
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}
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free_var(&vN);
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free_var(&vNminus1);
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free_var(&vsumX);
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free_var(&vsumX2);
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PG_RETURN_NUMERIC(res);
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PG_RETURN_NUMERIC(res);
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}
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Datum
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numeric_stddev_samp(PG_FUNCTION_ARGS)
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{
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Numeric res;
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bool is_null;
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res = numeric_stddev_internal(PG_GETARG_ARRAYTYPE_P(0),
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false, true, &is_null);
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if (is_null)
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PG_RETURN_NULL();
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else
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PG_RETURN_NUMERIC(res);
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}
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Datum
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numeric_var_pop(PG_FUNCTION_ARGS)
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{
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Numeric res;
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bool is_null;
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res = numeric_stddev_internal(PG_GETARG_ARRAYTYPE_P(0),
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true, false, &is_null);
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if (is_null)
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PG_RETURN_NULL();
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else
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PG_RETURN_NUMERIC(res);
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}
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|
||||
Datum
|
||||
numeric_stddev_pop(PG_FUNCTION_ARGS)
|
||||
{
|
||||
Numeric res;
|
||||
bool is_null;
|
||||
|
||||
res = numeric_stddev_internal(PG_GETARG_ARRAYTYPE_P(0),
|
||||
false, false, &is_null);
|
||||
|
||||
if (is_null)
|
||||
PG_RETURN_NULL();
|
||||
else
|
||||
PG_RETURN_NUMERIC(res);
|
||||
}
|
||||
|
||||
/*
|
||||
* SUM transition functions for integer datatypes.
|
||||
|
||||
@ -37,7 +37,7 @@
|
||||
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.319 2006/03/06 22:49:16 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/catalog/catversion.h,v 1.320 2006/03/10 20:15:26 neilc Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -53,6 +53,6 @@
|
||||
*/
|
||||
|
||||
/* yyyymmddN */
|
||||
#define CATALOG_VERSION_NO 200603061
|
||||
#define CATALOG_VERSION_NO 200603101
|
||||
|
||||
#endif
|
||||
|
||||
@ -8,7 +8,7 @@
|
||||
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_aggregate.h,v 1.53 2006/03/05 15:58:54 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_aggregate.h,v 1.54 2006/03/10 20:15:26 neilc Exp $
|
||||
*
|
||||
* NOTES
|
||||
* the genbki.sh script reads this file and generates .bki
|
||||
@ -144,21 +144,53 @@ DATA(insert ( 2245 bpchar_smaller - 1058 1042 _null_ ));
|
||||
*/
|
||||
DATA(insert ( 2147 int8inc - 0 20 0 ));
|
||||
|
||||
/* variance */
|
||||
DATA(insert ( 2148 int8_accum numeric_variance 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2149 int4_accum numeric_variance 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2150 int2_accum numeric_variance 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2151 float4_accum float8_variance 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2152 float8_accum float8_variance 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2153 numeric_accum numeric_variance 0 1231 "{0,0,0}" ));
|
||||
/* var_pop */
|
||||
DATA(insert ( 2718 int8_accum numeric_var_pop 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2719 int4_accum numeric_var_pop 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2720 int2_accum numeric_var_pop 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2721 float4_accum float8_var_pop 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2722 float8_accum float8_var_pop 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2723 numeric_accum numeric_var_pop 0 1231 "{0,0,0}" ));
|
||||
|
||||
/* stddev */
|
||||
DATA(insert ( 2154 int8_accum numeric_stddev 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2155 int4_accum numeric_stddev 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2156 int2_accum numeric_stddev 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2157 float4_accum float8_stddev 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2158 float8_accum float8_stddev 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2159 numeric_accum numeric_stddev 0 1231 "{0,0,0}" ));
|
||||
/* var_samp */
|
||||
DATA(insert ( 2641 int8_accum numeric_var_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2642 int4_accum numeric_var_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2643 int2_accum numeric_var_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2644 float4_accum float8_var_samp 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2645 float8_accum float8_var_samp 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2646 numeric_accum numeric_var_samp 0 1231 "{0,0,0}" ));
|
||||
|
||||
/* variance: historical Postgres syntax for var_samp */
|
||||
DATA(insert ( 2148 int8_accum numeric_var_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2149 int4_accum numeric_var_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2150 int2_accum numeric_var_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2151 float4_accum float8_var_samp 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2152 float8_accum float8_var_samp 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2153 numeric_accum numeric_var_samp 0 1231 "{0,0,0}" ));
|
||||
|
||||
/* stddev_pop */
|
||||
DATA(insert ( 2724 int8_accum numeric_stddev_pop 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2725 int4_accum numeric_stddev_pop 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2726 int2_accum numeric_stddev_pop 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2727 float4_accum float8_stddev_pop 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2728 float8_accum float8_stddev_pop 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2729 numeric_accum numeric_stddev_pop 0 1231 "{0,0,0}" ));
|
||||
|
||||
/* stddev_samp */
|
||||
DATA(insert ( 2712 int8_accum numeric_stddev_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2713 int4_accum numeric_stddev_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2714 int2_accum numeric_stddev_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2715 float4_accum float8_stddev_samp 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2716 float8_accum float8_stddev_samp 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2717 numeric_accum numeric_stddev_samp 0 1231 "{0,0,0}" ));
|
||||
|
||||
/* stddev: historical Postgres syntax for stddev_samp */
|
||||
DATA(insert ( 2154 int8_accum numeric_stddev_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2155 int4_accum numeric_stddev_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2156 int2_accum numeric_stddev_samp 0 1231 "{0,0,0}" ));
|
||||
DATA(insert ( 2157 float4_accum float8_stddev_samp 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2158 float8_accum float8_stddev_samp 0 1022 "{0,0,0}" ));
|
||||
DATA(insert ( 2159 numeric_accum numeric_stddev_samp 0 1231 "{0,0,0}" ));
|
||||
|
||||
/* boolean-and and boolean-or */
|
||||
DATA(insert ( 2517 booland_statefunc - 0 16 _null_ ));
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.403 2006/03/10 19:12:51 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/catalog/pg_proc.h,v 1.404 2006/03/10 20:15:26 neilc Exp $
|
||||
*
|
||||
* NOTES
|
||||
* The script catalog/genbki.sh reads this file and generates .bki
|
||||
@ -2668,10 +2668,14 @@ DESCR("join selectivity of case-insensitive regex non-match");
|
||||
/* Aggregate-related functions */
|
||||
DATA(insert OID = 1830 ( float8_avg PGNSP PGUID 12 f f t f i 1 701 "1022" _null_ _null_ _null_ float8_avg - _null_ ));
|
||||
DESCR("AVG aggregate final function");
|
||||
DATA(insert OID = 1831 ( float8_variance PGNSP PGUID 12 f f t f i 1 701 "1022" _null_ _null_ _null_ float8_variance - _null_ ));
|
||||
DESCR("VARIANCE aggregate final function");
|
||||
DATA(insert OID = 1832 ( float8_stddev PGNSP PGUID 12 f f t f i 1 701 "1022" _null_ _null_ _null_ float8_stddev - _null_ ));
|
||||
DESCR("STDDEV aggregate final function");
|
||||
DATA(insert OID = 2512 ( float8_var_pop PGNSP PGUID 12 f f t f i 1 701 "1022" _null_ _null_ _null_ float8_var_pop - _null_ ));
|
||||
DESCR("VAR_POP aggregate final function");
|
||||
DATA(insert OID = 1831 ( float8_var_samp PGNSP PGUID 12 f f t f i 1 701 "1022" _null_ _null_ _null_ float8_var_samp - _null_ ));
|
||||
DESCR("VAR_SAMP aggregate final function");
|
||||
DATA(insert OID = 2513 ( float8_stddev_pop PGNSP PGUID 12 f f t f i 1 701 "1022" _null_ _null_ _null_ float8_stddev_pop - _null_ ));
|
||||
DESCR("STDDEV_POP aggregate final function");
|
||||
DATA(insert OID = 1832 ( float8_stddev_samp PGNSP PGUID 12 f f t f i 1 701 "1022" _null_ _null_ _null_ float8_stddev_samp - _null_ ));
|
||||
DESCR("STDDEV_SAMP aggregate final function");
|
||||
DATA(insert OID = 1833 ( numeric_accum PGNSP PGUID 12 f f t f i 2 1231 "1231 1700" _null_ _null_ _null_ numeric_accum - _null_ ));
|
||||
DESCR("aggregate transition function");
|
||||
DATA(insert OID = 1834 ( int2_accum PGNSP PGUID 12 f f t f i 2 1231 "1231 21" _null_ _null_ _null_ int2_accum - _null_ ));
|
||||
@ -2682,10 +2686,14 @@ DATA(insert OID = 1836 ( int8_accum PGNSP PGUID 12 f f t f i 2 1231 "1231 20
|
||||
DESCR("aggregate transition function");
|
||||
DATA(insert OID = 1837 ( numeric_avg PGNSP PGUID 12 f f t f i 1 1700 "1231" _null_ _null_ _null_ numeric_avg - _null_ ));
|
||||
DESCR("AVG aggregate final function");
|
||||
DATA(insert OID = 1838 ( numeric_variance PGNSP PGUID 12 f f t f i 1 1700 "1231" _null_ _null_ _null_ numeric_variance - _null_ ));
|
||||
DESCR("VARIANCE aggregate final function");
|
||||
DATA(insert OID = 1839 ( numeric_stddev PGNSP PGUID 12 f f t f i 1 1700 "1231" _null_ _null_ _null_ numeric_stddev - _null_ ));
|
||||
DESCR("STDDEV aggregate final function");
|
||||
DATA(insert OID = 2514 ( numeric_var_pop PGNSP PGUID 12 f f t f i 1 1700 "1231" _null_ _null_ _null_ numeric_var_pop - _null_ ));
|
||||
DESCR("VAR_POP aggregate final function");
|
||||
DATA(insert OID = 1838 ( numeric_var_samp PGNSP PGUID 12 f f t f i 1 1700 "1231" _null_ _null_ _null_ numeric_var_samp - _null_ ));
|
||||
DESCR("VAR_SAMP aggregate final function");
|
||||
DATA(insert OID = 2596 ( numeric_stddev_pop PGNSP PGUID 12 f f t f i 1 1700 "1231" _null_ _null_ _null_ numeric_stddev_pop - _null_ ));
|
||||
DESCR("STDDEV_POP aggregate final function");
|
||||
DATA(insert OID = 1839 ( numeric_stddev_samp PGNSP PGUID 12 f f t f i 1 1700 "1231" _null_ _null_ _null_ numeric_stddev_samp - _null_ ));
|
||||
DESCR("STDDEV_SAMP aggregate final function");
|
||||
DATA(insert OID = 1840 ( int2_sum PGNSP PGUID 12 f f f f i 2 20 "20 21" _null_ _null_ _null_ int2_sum - _null_ ));
|
||||
DESCR("SUM(int2) transition function");
|
||||
DATA(insert OID = 1841 ( int4_sum PGNSP PGUID 12 f f f f i 2 20 "20 23" _null_ _null_ _null_ int4_sum - _null_ ));
|
||||
@ -3115,6 +3123,20 @@ DATA(insert OID = 2245 ( min PGNSP PGUID 12 t f f f i 1 1042 "1042" _null_ _
|
||||
|
||||
DATA(insert OID = 2147 ( count PGNSP PGUID 12 t f f f i 1 20 "2276" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
|
||||
DATA(insert OID = 2718 ( var_pop PGNSP PGUID 12 t f f f i 1 1700 "20" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2719 ( var_pop PGNSP PGUID 12 t f f f i 1 1700 "23" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2720 ( var_pop PGNSP PGUID 12 t f f f i 1 1700 "21" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2721 ( var_pop PGNSP PGUID 12 t f f f i 1 701 "700" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2722 ( var_pop PGNSP PGUID 12 t f f f i 1 701 "701" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2723 ( var_pop PGNSP PGUID 12 t f f f i 1 1700 "1700" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
|
||||
DATA(insert OID = 2641 ( var_samp PGNSP PGUID 12 t f f f i 1 1700 "20" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2642 ( var_samp PGNSP PGUID 12 t f f f i 1 1700 "23" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2643 ( var_samp PGNSP PGUID 12 t f f f i 1 1700 "21" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2644 ( var_samp PGNSP PGUID 12 t f f f i 1 701 "700" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2645 ( var_samp PGNSP PGUID 12 t f f f i 1 701 "701" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2646 ( var_samp PGNSP PGUID 12 t f f f i 1 1700 "1700" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
|
||||
DATA(insert OID = 2148 ( variance PGNSP PGUID 12 t f f f i 1 1700 "20" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2149 ( variance PGNSP PGUID 12 t f f f i 1 1700 "23" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2150 ( variance PGNSP PGUID 12 t f f f i 1 1700 "21" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
@ -3122,6 +3144,20 @@ DATA(insert OID = 2151 ( variance PGNSP PGUID 12 t f f f i 1 701 "700" _null_
|
||||
DATA(insert OID = 2152 ( variance PGNSP PGUID 12 t f f f i 1 701 "701" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2153 ( variance PGNSP PGUID 12 t f f f i 1 1700 "1700" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
|
||||
DATA(insert OID = 2724 ( stddev_pop PGNSP PGUID 12 t f f f i 1 1700 "20" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2725 ( stddev_pop PGNSP PGUID 12 t f f f i 1 1700 "23" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2726 ( stddev_pop PGNSP PGUID 12 t f f f i 1 1700 "21" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2727 ( stddev_pop PGNSP PGUID 12 t f f f i 1 701 "700" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2728 ( stddev_pop PGNSP PGUID 12 t f f f i 1 701 "701" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2729 ( stddev_pop PGNSP PGUID 12 t f f f i 1 1700 "1700" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
|
||||
DATA(insert OID = 2712 ( stddev_samp PGNSP PGUID 12 t f f f i 1 1700 "20" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2713 ( stddev_samp PGNSP PGUID 12 t f f f i 1 1700 "23" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2714 ( stddev_samp PGNSP PGUID 12 t f f f i 1 1700 "21" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2715 ( stddev_samp PGNSP PGUID 12 t f f f i 1 701 "700" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2716 ( stddev_samp PGNSP PGUID 12 t f f f i 1 701 "701" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2717 ( stddev_samp PGNSP PGUID 12 t f f f i 1 1700 "1700" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
|
||||
DATA(insert OID = 2154 ( stddev PGNSP PGUID 12 t f f f i 1 1700 "20" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2155 ( stddev PGNSP PGUID 12 t f f f i 1 1700 "23" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
DATA(insert OID = 2156 ( stddev PGNSP PGUID 12 t f f f i 1 1700 "21" _null_ _null_ _null_ aggregate_dummy - _null_ ));
|
||||
|
||||
@ -7,7 +7,7 @@
|
||||
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
|
||||
* Portions Copyright (c) 1994, Regents of the University of California
|
||||
*
|
||||
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.276 2006/03/05 15:59:06 momjian Exp $
|
||||
* $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.277 2006/03/10 20:15:27 neilc Exp $
|
||||
*
|
||||
*-------------------------------------------------------------------------
|
||||
*/
|
||||
@ -340,8 +340,10 @@ extern Datum setseed(PG_FUNCTION_ARGS);
|
||||
extern Datum float8_accum(PG_FUNCTION_ARGS);
|
||||
extern Datum float4_accum(PG_FUNCTION_ARGS);
|
||||
extern Datum float8_avg(PG_FUNCTION_ARGS);
|
||||
extern Datum float8_variance(PG_FUNCTION_ARGS);
|
||||
extern Datum float8_stddev(PG_FUNCTION_ARGS);
|
||||
extern Datum float8_var_pop(PG_FUNCTION_ARGS);
|
||||
extern Datum float8_var_samp(PG_FUNCTION_ARGS);
|
||||
extern Datum float8_stddev_pop(PG_FUNCTION_ARGS);
|
||||
extern Datum float8_stddev_samp(PG_FUNCTION_ARGS);
|
||||
extern Datum float48pl(PG_FUNCTION_ARGS);
|
||||
extern Datum float48mi(PG_FUNCTION_ARGS);
|
||||
extern Datum float48mul(PG_FUNCTION_ARGS);
|
||||
@ -814,8 +816,10 @@ extern Datum int2_accum(PG_FUNCTION_ARGS);
|
||||
extern Datum int4_accum(PG_FUNCTION_ARGS);
|
||||
extern Datum int8_accum(PG_FUNCTION_ARGS);
|
||||
extern Datum numeric_avg(PG_FUNCTION_ARGS);
|
||||
extern Datum numeric_variance(PG_FUNCTION_ARGS);
|
||||
extern Datum numeric_stddev(PG_FUNCTION_ARGS);
|
||||
extern Datum numeric_var_pop(PG_FUNCTION_ARGS);
|
||||
extern Datum numeric_var_samp(PG_FUNCTION_ARGS);
|
||||
extern Datum numeric_stddev_pop(PG_FUNCTION_ARGS);
|
||||
extern Datum numeric_stddev_samp(PG_FUNCTION_ARGS);
|
||||
extern Datum int2_sum(PG_FUNCTION_ARGS);
|
||||
extern Datum int4_sum(PG_FUNCTION_ARGS);
|
||||
extern Datum int8_sum(PG_FUNCTION_ARGS);
|
||||
|
||||
@ -75,6 +75,68 @@ SELECT max(student.gpa) AS max_3_7 FROM student;
|
||||
3.7
|
||||
(1 row)
|
||||
|
||||
SELECT stddev_pop(b) FROM aggtest;
|
||||
stddev_pop
|
||||
-----------------
|
||||
131.10703231895
|
||||
(1 row)
|
||||
|
||||
SELECT stddev_samp(b) FROM aggtest;
|
||||
stddev_samp
|
||||
------------------
|
||||
151.389360803998
|
||||
(1 row)
|
||||
|
||||
SELECT var_pop(b) FROM aggtest;
|
||||
var_pop
|
||||
------------------
|
||||
17189.0539234823
|
||||
(1 row)
|
||||
|
||||
SELECT var_samp(b) FROM aggtest;
|
||||
var_samp
|
||||
------------------
|
||||
22918.7385646431
|
||||
(1 row)
|
||||
|
||||
SELECT stddev_pop(b::numeric) FROM aggtest;
|
||||
stddev_pop
|
||||
------------------
|
||||
151.389361431288
|
||||
(1 row)
|
||||
|
||||
SELECT stddev_samp(b::numeric) FROM aggtest;
|
||||
stddev_samp
|
||||
------------------
|
||||
151.389361431288
|
||||
(1 row)
|
||||
|
||||
SELECT var_pop(b::numeric) FROM aggtest;
|
||||
var_pop
|
||||
--------------------
|
||||
22918.738754573025
|
||||
(1 row)
|
||||
|
||||
SELECT var_samp(b::numeric) FROM aggtest;
|
||||
var_samp
|
||||
--------------------
|
||||
22918.738754573025
|
||||
(1 row)
|
||||
|
||||
-- population variance is defined for a single tuple, sample variance
|
||||
-- is not
|
||||
SELECT var_pop(1.0), var_samp(2.0);
|
||||
var_pop | var_samp
|
||||
---------+----------
|
||||
0 |
|
||||
(1 row)
|
||||
|
||||
SELECT stddev_pop(3.0::numeric), stddev_samp(4.0::numeric);
|
||||
stddev_pop | stddev_samp
|
||||
------------+-------------
|
||||
0 |
|
||||
(1 row)
|
||||
|
||||
SELECT count(four) AS cnt_1000 FROM onek;
|
||||
cnt_1000
|
||||
----------
|
||||
|
||||
@ -15,25 +15,31 @@ SELECT avg(gpa) AS avg_3_4 FROM ONLY student;
|
||||
|
||||
|
||||
SELECT sum(four) AS sum_1500 FROM onek;
|
||||
|
||||
SELECT sum(a) AS sum_198 FROM aggtest;
|
||||
|
||||
SELECT sum(b) AS avg_431_773 FROM aggtest;
|
||||
|
||||
SELECT sum(gpa) AS avg_6_8 FROM ONLY student;
|
||||
|
||||
|
||||
SELECT max(four) AS max_3 FROM onek;
|
||||
|
||||
SELECT max(a) AS max_100 FROM aggtest;
|
||||
|
||||
SELECT max(aggtest.b) AS max_324_78 FROM aggtest;
|
||||
|
||||
SELECT max(student.gpa) AS max_3_7 FROM student;
|
||||
|
||||
SELECT stddev_pop(b) FROM aggtest;
|
||||
SELECT stddev_samp(b) FROM aggtest;
|
||||
SELECT var_pop(b) FROM aggtest;
|
||||
SELECT var_samp(b) FROM aggtest;
|
||||
|
||||
SELECT stddev_pop(b::numeric) FROM aggtest;
|
||||
SELECT stddev_samp(b::numeric) FROM aggtest;
|
||||
SELECT var_pop(b::numeric) FROM aggtest;
|
||||
SELECT var_samp(b::numeric) FROM aggtest;
|
||||
|
||||
-- population variance is defined for a single tuple, sample variance
|
||||
-- is not
|
||||
SELECT var_pop(1.0), var_samp(2.0);
|
||||
SELECT stddev_pop(3.0::numeric), stddev_samp(4.0::numeric);
|
||||
|
||||
SELECT count(four) AS cnt_1000 FROM onek;
|
||||
|
||||
SELECT count(DISTINCT four) AS cnt_4 FROM onek;
|
||||
|
||||
select ten, count(*), sum(four) from onek
|
||||
@ -44,9 +50,7 @@ group by ten order by ten;
|
||||
|
||||
|
||||
SELECT newavg(four) AS avg_1 FROM onek;
|
||||
|
||||
SELECT newsum(four) AS sum_1500 FROM onek;
|
||||
|
||||
SELECT newcnt(four) AS cnt_1000 FROM onek;
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user