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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2014-06-19 22:13:41 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2014-06-19 22:14:26 -0400 |
| commit | 45b0f357235236dd3198f8abcca277adc0d7459a (patch) | |
| tree | f8a91f92510a5a8a0e62ef4698a2c878bf85e7f5 /src/include/executor | |
| parent | 686f362bee126e50280bcd3b35807b02f18a8966 (diff) | |
| download | postgresql-45b0f357235236dd3198f8abcca277adc0d7459a.tar.gz postgresql-45b0f357235236dd3198f8abcca277adc0d7459a.zip | |
Avoid leaking memory while evaluating arguments for a table function.
ExecMakeTableFunctionResult evaluated the arguments for a function-in-FROM
in the query-lifespan memory context. This is insignificant in simple
cases where the function relation is scanned only once; but if the function
is in a sub-SELECT or is on the inside of a nested loop, any memory
consumed during argument evaluation can add up quickly. (The potential for
trouble here had been foreseen long ago, per existing comments; but we'd
not previously seen a complaint from the field about it.) To fix, create
an additional temporary context just for this purpose.
Per an example from MauMau. Back-patch to all active branches.
Diffstat (limited to 'src/include/executor')
| -rw-r--r-- | src/include/executor/executor.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/executor/executor.h b/src/include/executor/executor.h index 5e4a15ca747..239aff32088 100644 --- a/src/include/executor/executor.h +++ b/src/include/executor/executor.h @@ -231,6 +231,7 @@ extern Datum GetAttributeByName(HeapTupleHeader tuple, const char *attname, bool *isNull); extern Tuplestorestate *ExecMakeTableFunctionResult(ExprState *funcexpr, ExprContext *econtext, + MemoryContext argContext, TupleDesc expectedDesc, bool randomAccess); extern Datum ExecEvalExprSwitchContext(ExprState *expression, ExprContext *econtext, |