Rename NodeTag of ExprState

Rename from tag to type, for consistency with all other node structs.

Discussion: https://www.postgresql.org/message-id/flat/c1097590-a6a4-486a-64b1-e1f9cc0533ce@enterprisedb.com

Author: petere

src/backend/executor/execExpr.c

@@ -363,7 +363,7 @@ ExecBuildProjectionInfo(List *targetList,
 
 	projInfo->pi_exprContext = econtext;
 	/* We embed ExprState into ProjectionInfo instead of doing extra palloc */
-	projInfo->pi_state.tag = T_ExprState;
+	projInfo->pi_state.type = T_ExprState;
 	state = &projInfo->pi_state;
 	state->expr = (Expr *) targetList;
 	state->parent = parent;
@@ -531,7 +531,7 @@ ExecBuildUpdateProjection(List *targetList,
 
 	projInfo->pi_exprContext = econtext;
 	/* We embed ExprState into ProjectionInfo instead of doing extra palloc */
-	projInfo->pi_state.tag = T_ExprState;
+	projInfo->pi_state.type = T_ExprState;
 	state = &projInfo->pi_state;
 	if (evalTargetList)
 		state->expr = (Expr *) targetList;

src/include/nodes/execnodes.h

@@ -60,7 +60,7 @@ typedef Datum (*ExprStateEvalFunc) (struct ExprState *expression,
 
 typedef struct ExprState
 {
-	NodeTag		tag;
+	NodeTag		type;
 
 	uint8		flags;			/* bitmask of EEO_FLAG_* bits, see above */