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Commit1d96bb9

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Initialize pad bytes in GinFormTuple().
Every other core buffer page consumer initializes the bytes it furnishesto PageAddItem(). For consistency, do the same here. No back-patch;regardless, we couldn't count on the fix so long as binary upgrade cancarry forward affected index builds.
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‎src/backend/access/gin/ginentrypage.c

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@@ -112,6 +112,12 @@ GinFormTuple(GinState *ginstate,
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if (newsize!=IndexTupleSize(itup))
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{
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itup=repalloc(itup,newsize);
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/*
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* PostgreSQL 9.3 and earlier did not clear this new space, so we
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* might find uninitialized padding when reading tuples from disk.
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*/
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memset((char*)itup+IndexTupleSize(itup),
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0,newsize-IndexTupleSize(itup));
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/* set new size in tuple header */
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itup->t_info &= ~INDEX_SIZE_MASK;

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