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| author | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2017-07-12 22:03:38 +0300 |
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| committer | Heikki Linnakangas <heikki.linnakangas@iki.fi> | 2017-07-12 22:03:58 +0300 |
| commit | 209970ded835ffe2f354220da77f3df9a7a7dab4 (patch) | |
| tree | ee3eb53c0778d79bbe69ce8ac331de3580199eea /src/backend/utils/adt/json.c | |
| parent | e7213fe2bda8a90b3570e9a41a25a620913b649a (diff) | |
| download | postgresql-209970ded835ffe2f354220da77f3df9a7a7dab4.tar.gz postgresql-209970ded835ffe2f354220da77f3df9a7a7dab4.zip | |
Reduce memory usage of tsvector type analyze function.
compute_tsvector_stats() detoasted and kept in memory every tsvector value
in the sample, but that can be a lot of memory. The original bug report
described a case using over 10 gigabytes, with statistics target of 10000
(the maximum).
To fix, allocate a separate copy of just the lexemes that we keep around,
and free the detoasted tsvector values as we go. This adds some palloc/pfree
overhead, when you have a lot of distinct lexemes in the sample, but it's
better than running out of memory.
Fixes bug #14654 reported by James C. Reviewed by Tom Lane. Backport to
all supported versions.
Discussion: https://www.postgresql.org/message-id/20170514200602.1451.46797@wrigleys.postgresql.org
Diffstat (limited to 'src/backend/utils/adt/json.c')
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