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db14dcdec6
When building a tuplesort during parallel GIN builds, the function incorrectly looked up the default B-Tree operator, not the function associated with the GIN opclass (through GIN_COMPARE_PROC). Fixed by using the same logic as initGinState(), and the other place in parallel GIN builds. This could cause two types of issues. First, a data type might not have a B-Tree opclass, in which case the PrepareSortSupportFromOrderingOp() fails with an ERROR. Second, a data type might have both B-Tree and GIN opclasses, defining order/equality in different ways. This could lead to logical corruption in the index. Backpatch to 18, where parallel GIN builds were introduced. Discussion: https://postgr.es/m/73a28b94-43d5-4f77-b26e-0d642f6de777@iki.fi Reported-by: Heikki Linnakangas <hlinnaka@iki.fi> Backpatch-through: 18