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Extend sortsupport for text to more opclasses.

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Have varlena.c expose an interface that allows the char(n), bytea, and
bpchar types to piggyback on a now-generalized SortSupport for text.
This pushes a little more knowledge of the bpchar/char(n) type into
varlena.c than might be preferred, but that seems like the approach
that creates least friction.  Also speed things up for index builds
that use text_pattern_ops or varchar_pattern_ops.

This patch does quite a bit of renaming, but it seems likely to be
worth it, so as to avoid future confusion about the fact that this code
is now more generally used than the old names might have suggested.

Peter Geoghegan, reviewed by Álvaro Herrera and Andreas Karlsson,
with small tweaks by me.
This commit is contained in:
Robert Haas
2016-02-03 14:17:35 -05:00
parent 24a26c9f54
commit b47b4dbf68
8 changed files with 336 additions and 136 deletions
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src/include/utils/bytea.h
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@ -42,6 +42,7 @@ extern Datum byteale(PG_FUNCTION_ARGS);
extern Datum byteagt(PG_FUNCTION_ARGS);
extern Datum byteage(PG_FUNCTION_ARGS);
extern Datum byteacmp(PG_FUNCTION_ARGS);
extern Datum bytea_sortsupport(PG_FUNCTION_ARGS);
extern Datum byteacat(PG_FUNCTION_ARGS);
extern Datum byteapos(PG_FUNCTION_ARGS);
extern Datum bytea_substr(PG_FUNCTION_ARGS);