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Remove dead code in toast_fetch_datum_slice 

In toast_fetch_datum_slice(), we Assert() that what is passed in isn't
compressed, but we then later had a check to see what the length of if
what was passed in is compressed.  That later check is rather confusing
since toast_fetch_datum_slice() is only ever called with non-compressed
datums and the Assert() earlier makes it clear that one shouldn't be
passing in compressed datums.

Add a comment to make it clear that toast_fetch_datum_slice() is just
for non-compressed datums, and remove the dead code.
This commit is contained in:
Stephen Frost 2018-12-10 09:31:38 -05:00
parent 6d8727f95e
commit 96c702c1ed
1 changed files with 3 additions and 4 deletions
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7
src/backend/access/heap/tuptoaster.c
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@ -2026,6 +2026,8 @@ toast_fetch_datum(struct varlena *attr)
*
* Reconstruct a segment of a Datum from the chunks saved
* in the toast relation
*
* Note that this function only supports non-compressed external datums.
* ----------
*/
static struct varlena *
@ -2085,10 +2087,7 @@ toast_fetch_datum_slice(struct varlena *attr, int32 sliceoffset, int32 length)
result = (struct varlena *) palloc(length + VARHDRSZ);
if (VARATT_EXTERNAL_IS_COMPRESSED(toast_pointer))
SET_VARSIZE_COMPRESSED(result, length + VARHDRSZ);
else
SET_VARSIZE(result, length + VARHDRSZ);
SET_VARSIZE(result, length + VARHDRSZ);
if (length == 0)
return result; /* Can save a lot of work at this point! */