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Add missing CHECK_FOR_INTERRUPTS in lseg_inside_poly

Apparently, there are bugs in this code that cause it to loop endlessly.That bug still needs more research, but in the meantime it's clear thatthe loop is missing a check for interrupts so that it can be cancelledtimely.Backpatch to 9.1 -- this has been missing since49475aa.

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src/backend/utils/adt
- geo_ops.c

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`‎src/backend/utils/adt/geo_ops.c`

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Original file line number	Diff line number	Diff line change
`@@ -20,6 +20,7 @@`
`20`	`20`	`#include<ctype.h>`
`21`	`21`
`22`	`22`	`#include"libpq/pqformat.h"`
	`23`	`+#include"miscadmin.h"`
`23`	`24`	`#include"utils/builtins.h"`
`24`	`25`	`#include"utils/geo_decls.h"`
`25`	`26`
`@@ -3894,6 +3895,8 @@ lseg_inside_poly(Point a, Point b, POLYGON *poly, int start)`
`3894`	`3895`	`{`
`3895`	`3896`	`Point*interpt;`
`3896`	`3897`
	`3898`	`+CHECK_FOR_INTERRUPTS();`
	`3899`	`+`
`3897`	`3900`	`s.p[1]=poly->p[i];`
`3898`	`3901`
`3899`	`3902`	`if (on_ps_internal(t.p,&s))`

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Commitb9a46f8

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`‎src/backend/utils/adt/geo_ops.c`

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