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Improve comments about ProcessUtility's queryString parameter.

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Per discussion with Craig Ringer.
This commit is contained in:
Tom Lane 2017-01-27 10:02:04 -05:00
parent fefb86b147
commit fde5c03792
1 changed files with 12 additions and 3 deletions
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15
src/backend/tcop/utility.c
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@ -311,13 +311,22 @@ CheckRestrictedOperation(const char *cmdname)
* completionTag: points to a buffer of size COMPLETION_TAG_BUFSIZE
* in which to store a command completion status string.
*
* Notes: as of PG 8.4, caller MUST supply a queryString; it is not
* allowed anymore to pass NULL. (If you really don't have source text,
* you can pass a constant string, perhaps "(query not available)".)
* Caller MUST supply a queryString; it is not allowed (anymore) to pass NULL.
* If you really don't have source text, you can pass a constant string,
* perhaps "(query not available)".
*
* completionTag is only set nonempty if we want to return a nondefault status.
*
* completionTag may be NULL if caller doesn't want a status string.
*
* Note for users of ProcessUtility_hook: the same queryString may be passed
* to multiple invocations of ProcessUtility when processing a query string
* containing multiple semicolon-separated statements. One should use
* pstmt->stmt_location and pstmt->stmt_len to identify the substring
* containing the current statement. Keep in mind also that some utility
* statements (e.g., CREATE SCHEMA) will recurse to ProcessUtility to process
* sub-statements, often passing down the same queryString, stmt_location,
* and stmt_len that were given for the whole statement.
*/
void
ProcessUtility(PlannedStmt *pstmt,