Commit1337568

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add comment and safety assert

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Original file line number	Diff line number	Diff line change
`@@ -134,6 +134,8 @@ plan_tree_walker(Plan *plan,`
`134`	`134`	`/* Since they look alike */`
`135`	`135`	`caseT_MergeAppend:`
`136`	`136`	`caseT_Append:`
	`137`	`+Assert(offsetof(Append,appendplans)==`
	`138`	`+ offsetof(MergeAppend,mergeplans));`
`137`	`139`	`foreach(l, ((Append*)plan)->appendplans)`
`138`	`140`	`plan_tree_walker((Plan*)lfirst(l),visitor,context);`
`139`	`141`	`break;`
`@@ -195,6 +197,7 @@ pathman_transform_query_walker(Node node, void context)`
`195`	`197`	`next_context=*current_context;`
`196`	`198`	`next_context.parent_sublink= (SubLink*)node;`
`197`	`199`
	`200`	`+/* Handle expression subtree */`
`198`	`201`	`returnexpression_tree_walker(node,`
`199`	`202`	`pathman_transform_query_walker,`
`200`	`203`	`(void*)&next_context);`

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