Make pgstatindex respond to cancel interrupts.
A similar problem for pgstattuple() was fixed in April of 2010 by commit 33065ef8bc52253ae855bc959576e52d8a28ba06, but pgstatindex() seems to have been overlooked. Back-patch all the way, as with that commit, though not to 7.4 through 8.1, since those are now EOL.
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@ -155,6 +155,8 @@ pgstatindex(PG_FUNCTION_ARGS)
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Page page;
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BTPageOpaque opaque;
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CHECK_FOR_INTERRUPTS();
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/* Read and lock buffer */
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buffer = ReadBuffer(rel, blkno);
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LockBuffer(buffer, BUFFER_LOCK_SHARE);
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