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Allow _h_indexbuild() to be interrupted.

When we are building a hash index that is large enough to needpre-sorting (larger than either maintenance_work_mem or NBuffers),the initial sorting phase is interruptible, but the insertionphase wasn't. Add the missing CHECK_FOR_INTERRUPTS().Per bug #18616 from Alexander Lakhin. Back-patch to allsupported branches.Pavel BorisovDiscussion:https://postgr.es/m/18616-acbb9e5caf41e964@postgresql.org

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src/backend/access/hash
- hashsort.c

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`‎src/backend/access/hash/hashsort.c‎`

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Original file line number	Diff line number	Diff line change
`@@ -148,6 +148,9 @@ _h_indexbuild(HSpool *hspool, Relation heapRel)`
`148`	`148`	`/* the tuples are sorted by hashkey, so pass 'sorted' as true */`
`149`	`149`	`_hash_doinsert(hspool->index,itup,heapRel, true);`
`150`	`150`
	`151`	`+/* allow insertion phase to be interrupted, and track progress */`
	`152`	`+CHECK_FOR_INTERRUPTS();`
	`153`	`+`
`151`	`154`	`pgstat_progress_update_param(PROGRESS_CREATEIDX_TUPLES_DONE,`
`152`	`155`	`++tups_done);`
`153`	`156`	`}`

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Commitfae55f0

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`‎src/backend/access/hash/hashsort.c‎`

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