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Diffstat (limited to 'src/backend/optimizer/path/allpaths.c')
| -rw-r--r-- | src/backend/optimizer/path/allpaths.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c index 5682fd276ed..511452bc1c7 100644 --- a/src/backend/optimizer/path/allpaths.c +++ b/src/backend/optimizer/path/allpaths.c @@ -2400,6 +2400,18 @@ check_and_push_window_quals(Query *subquery, RangeTblEntry *rte, Index rti, return true; /* + * Currently, we restrict this optimization to strict OpExprs. The reason + * for this is that during execution, once the runcondition becomes false, + * we stop evaluating WindowFuncs. To avoid leaving around stale window + * function result values, we set them to NULL. Having only strict + * OpExprs here ensures that we properly filter out the tuples with NULLs + * in the top-level WindowAgg. + */ + set_opfuncid(opexpr); + if (!func_strict(opexpr->opfuncid)) + return true; + + /* * Check for plain Vars that reference window functions in the subquery. * If we find any, we'll ask find_window_run_conditions() if 'opexpr' can * be used as part of the run condition. |