Commit04910a3

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Put back gistgettuple's check for backwards scan request.

On reflection it's a bad idea for the KNNGIST patch to have removed that.We don't want it silently returning incorrect answers.

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Original file line number	Diff line number	Diff line change
`@@ -459,8 +459,12 @@ Datum`
`459`	`459`	`gistgettuple(PG_FUNCTION_ARGS)`
`460`	`460`	`{`
`461`	`461`	`IndexScanDescscan= (IndexScanDesc)PG_GETARG_POINTER(0);`
	`462`	`+ScanDirectiondir= (ScanDirection)PG_GETARG_INT32(1);`
`462`	`463`	`GISTScanOpaqueso= (GISTScanOpaque)scan->opaque;`
`463`	`464`
	`465`	`+if (dir!=ForwardScanDirection)`
	`466`	`+elog(ERROR,"GiST only supports forward scan direction");`
	`467`	`+`
`464`	`468`	`if (!so->qual_ok)`
`465`	`469`	`PG_RETURN_BOOL(false);`
`466`	`470`

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