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Check calling context for connectby_text(), per Joe Conway.

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Original file line number	Diff line number	Diff line change
`@@ -1048,6 +1048,11 @@ connectby_text(PG_FUNCTION_ARGS)`
`1048`	`1048`	`MemoryContextper_query_ctx;`
`1049`	`1049`	`MemoryContextoldcontext;`
`1050`	`1050`
	`1051`	`+/* check to see if caller supports us returning a tuplestore */`
	`1052`	`+if (!rsinfo\|\| !(rsinfo->allowedModes&SFRM_Materialize))`
	`1053`	`+elog(ERROR,"connectby: materialize mode required, but it is not "`
	`1054`	`+"allowed in this context");`
	`1055`	`+`
`1051`	`1056`	`if (fcinfo->nargs==6)`
`1052`	`1057`	`{`
`1053`	`1058`	`branch_delim=GET_STR(PG_GETARG_TEXT_P(5));`

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