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Add comment in get_part_expression_info

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Original file line number	Diff line number	Diff line change
`@@ -1840,6 +1840,7 @@ get_part_expression_info(Oid relid, const char *expr_string,`
`1840`	`1840`	`/* Plan this query. We reuse 'expr_node' here */`
`1841`	`1841`	`plan=pg_plan_query(query,0,NULL);`
`1842`	`1842`	`if (IsA(plan->planTree,IndexOnlyScan))`
	`1843`	`+/* we get IndexOnlyScan in targetlist if expression is primary key */`
`1843`	`1844`	`target_entry=linitial(((IndexOnlyScan*)plan->planTree)->indextlist);`
`1844`	`1845`	`else`
`1845`	`1846`	`target_entry=linitial(plan->planTree->targetlist);`

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