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Move a comment from the to-be-deleted section of nodes.h to where it might still be useful.
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@@ -218,12 +218,6 @@ typedef enum NodeTag
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/*
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* TAGS FOR EXPRESSION STATE NODES (execnodes.h)
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*
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* ExprState represents the evaluation state for a whole expression tree.
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* Most Expr-based plan nodes do not have a corresponding expression state
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* node, they're fully handled within execExpr* - but sometimes the state
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* needs to be shared with other parts of the executor, as for example
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* with SubPlanState, which nodeSubplan.c has to modify.
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*/
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T_ExprState,
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T_WindowFuncExprState,
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