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When reading from a text- or CSV-format file in file_fdw, the datatype input routines can consume a significant fraction of the runtime. Often, the query does not need all the columns, so we can get a useful speed boost by skipping I/O conversion for unnecessary columns. To support this, add a "convert_selectively" option to the core COPY code. This is undocumented and not accessible from SQL (for now, anyway). Etsuro Fujita, reviewed by KaiGai Kohei |
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expected | ||
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sql | ||
.gitignore | ||
file_fdw--1.0.sql | ||
file_fdw.c | ||
file_fdw.control | ||
Makefile |