pike.git/ lib/ modules/ Sql.pmod/ pgsql_util.pmod

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2017-07-28

2017-07-28 13:46:09 by Stephen R. van den Berg <srb@cuci.nl>

pgsql: Document implementation decision.

68:    =iregexp("^\a*(COMMIT|ROLLBACK|END)([; \t\f\r\n]|$)");       /* For statements matching execfetchlimit the resultrows will not be -  * fetched in pieces +  * fetched in pieces. This heuristic will be sub-optimal whenever +  * either an UPDATE/DELETE/INSERT statement is prefixed by WITH, or +  * if there is a RETURNING with a *lot* of results. In those cases +  * the portal will be busy until all results have been fetched, and will +  * not be able to deliver results belonging to other parallel queries +  * running on the same filedescriptor. +  * +  * However, considering that the current heuristic increases query-speed +  * in the majority of the real-world cases, it would be considered a good +  * tradeoff.    */   private Regexp execfetchlimit    =iregexp("^\a*((UPDA|DELE)TE|INSERT)\a|\aLIMIT\a+[1-9][; \t\f\r\n]*$");