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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2011-08-20 14:51:02 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2011-08-20 14:51:48 -0400 |
| commit | f4fe6c643361670f085f4915ef05882810ffdee9 (patch) | |
| tree | e199dbff914b3bcc72a9cdb9f00a7969ed640758 /src/backend/utils/adt/tsvector_op.c | |
| parent | 8407a11c5a004671142a9ac2fe29de3844360b0b (diff) | |
Fix performance problem when building a lossy tidbitmap.
As pointed out by Sergey Koposov, repeated invocations of tbm_lossify can
make building a large tidbitmap into an O(N^2) operation. To fix, make
sure we remove more than the minimum amount of information per call, and
add a fallback path to behave sanely if we're unable to fit the bitmap
within the requested amount of memory.
This has been wrong since the tidbitmap code was written, so back-patch
to all supported branches.
Diffstat (limited to 'src/backend/utils/adt/tsvector_op.c')
0 files changed, 0 insertions, 0 deletions