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Document and clean up gistsplit.c.

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Improve comments, rename some variables and functions, slightly simplify
a couple of APIs, in an attempt to make this code readable by people other
than its original author.

Even though this is essentially just cosmetic, back-patch to all active
branches, because otherwise it's going to make back-patching future fixes
in this file very painful.
This commit is contained in:
Tom Lane
2013-02-10 11:58:23 -05:00
parent 3ea1ab283a
commit 2f0491dd1a
4 changed files with 320 additions and 171 deletions
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8
src/backend/access/gist/gist.c
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@ -1238,18 +1238,12 @@ gistSplit(Relation r,
IndexTuple *lvectup,
*rvectup;
GistSplitVector v;
GistEntryVector *entryvec;
int i;
SplitedPageLayout *res = NULL;
/* generate the item array */
entryvec = palloc(GEVHDRSZ + (len + 1) * sizeof(GISTENTRY));
entryvec->n = len + 1;
memset(v.spl_lisnull, TRUE, sizeof(bool) * giststate->tupdesc->natts);
memset(v.spl_risnull, TRUE, sizeof(bool) * giststate->tupdesc->natts);
gistSplitByKey(r, page, itup, len, giststate,
&v, entryvec, 0);
gistSplitByKey(r, page, itup, len, giststate, &v, 0);
/* form left and right vector */
lvectup = (IndexTuple *) palloc(sizeof(IndexTuple) * (len + 1));