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| author | Tom Lane | 2017-03-26 23:14:47 +0000 |
|---|---|---|
| committer | Tom Lane | 2017-03-26 23:14:57 +0000 |
| commit | 2f0903ea196503fc8af373a9de46b1e01a23508c (patch) | |
| tree | 9eceb4a64d9f6585508fcb2a2c003110cf040cc2 /src/include/access | |
| parent | 895f93701fd78b6faab6b437685357298a91dfe3 (diff) | |
Improve performance of ExecEvalWholeRowVar.
In commit b8d7f053c, we needed to fix ExecEvalWholeRowVar to not change
the state of the slot it's copying. The initial quick hack at that
required two rounds of tuple construction, which is not very nice.
To fix, add another primitive to tuptoaster.c that does precisely what
we need. (I initially tried to do this by refactoring one of the
existing functions into two pieces; but it looked like that might hurt
performance for the existing case, and the amount of code that could
be shared is not very large, so I gave up on that.)
Discussion: https://postgr.es/m/26088.1490315792@sss.pgh.pa.us
Diffstat (limited to 'src/include/access')
| -rw-r--r-- | src/include/access/tuptoaster.h | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/src/include/access/tuptoaster.h b/src/include/access/tuptoaster.h index a6233c386d..c7abeed812 100644 --- a/src/include/access/tuptoaster.h +++ b/src/include/access/tuptoaster.h @@ -194,6 +194,17 @@ extern Datum toast_flatten_tuple_to_datum(HeapTupleHeader tup, TupleDesc tupleDesc); /* ---------- + * toast_build_flattened_tuple - + * + * Build a tuple containing no out-of-line toasted fields. + * (This does not eliminate compressed or short-header datums.) + * ---------- + */ +extern HeapTuple toast_build_flattened_tuple(TupleDesc tupleDesc, + Datum *values, + bool *isnull); + +/* ---------- * toast_compress_datum - * * Create a compressed version of a varlena datum, if possible |