soft error variant of ExecPrepareExpr, ExecInitExpr

ExecInitExprSafe: soft error of ExecInitExpr.
ExecPrepareExprSafe: soft error of ExecPrepareExpr.
ExecPrepareExprSafe initialize for expression execution with soft error support.
not all expression node support it. Like node CoerceToDomain support it.

XXX more comments.

discussion: https://postgr.es/m/CACJufxE_+iZBR1i49k_AHigppPwLTJi6km8NOsC7FWvKdEmmXg@mail.gmail.com

Author: jianhe-fun

src/backend/executor/execExpr.c

@@ -170,6 +170,47 @@ ExecInitExpr(Expr *node, PlanState *parent)
 	return state;
 }
 
+/*
+ * ExecInitExprSafe: soft error variant of ExecInitExpr.
+ *
+ * use it only for expression nodes support soft errors, not all expression
+ * nodes support it.
+*/
+ExprState *
+ExecInitExprSafe(Expr *node, PlanState *parent)
+{
+	ExprState  *state;
+	ExprEvalStep scratch = {0};
+
+	/* Special case: NULL expression produces a NULL ExprState pointer */
+	if (node == NULL)
+		return NULL;
+
+	/* Initialize ExprState with empty step list */
+	state = makeNode(ExprState);
+	state->expr = node;
+	state->parent = parent;
+	state->ext_params = NULL;
+	state->escontext = makeNode(ErrorSaveContext);
+	state->escontext->type = T_ErrorSaveContext;
+	state->escontext->error_occurred = false;
+	state->escontext->details_wanted = true;
+
+	/* Insert setup steps as needed */
+	ExecCreateExprSetupSteps(state, (Node *) node);
+
+	/* Compile the expression proper */
+	ExecInitExprRec(node, state, &state->resvalue, &state->resnull);
+
+	/* Finally, append a DONE step */
+	scratch.opcode = EEOP_DONE_RETURN;
+	ExprEvalPushStep(state, &scratch);
+
+	ExecReadyExpr(state);
+
+	return state;
+}
+
 /*
  * ExecInitExprWithParams: prepare a standalone expression tree for execution
  *
@@ -778,6 +819,28 @@ ExecPrepareExpr(Expr *node, EState *estate)
 	return result;
 }
 
+/*
+ * ExecPrepareExprSafe: soft error variant of ExecPrepareExpr.
+ *
+ * use it when expression node *support* soft error expression execution.
+ */
+ExprState *
+ExecPrepareExprSafe(Expr *node, EState *estate)
+{
+	ExprState  *result;
+	MemoryContext oldcontext;
+
+	oldcontext = MemoryContextSwitchTo(estate->es_query_cxt);
+
+	node = expression_planner(node);
+
+	result = ExecInitExprSafe(node, NULL);
+
+	MemoryContextSwitchTo(oldcontext);
+
+	return result;
+}
+
 /*
  * ExecPrepareQual --- initialize for qual execution outside a normal
  * Plan tree context.

src/include/executor/executor.h

@@ -318,6 +318,7 @@ ExecProcNode(PlanState *node)
  * prototypes from functions in execExpr.c
  */
 extern ExprState *ExecInitExpr(Expr *node, PlanState *parent);
+extern ExprState *ExecInitExprSafe(Expr *node, PlanState *parent);
 extern ExprState *ExecInitExprWithParams(Expr *node, ParamListInfo ext_params);
 extern ExprState *ExecInitQual(List *qual, PlanState *parent);
 extern ExprState *ExecInitCheck(List *qual, PlanState *parent);
@@ -366,6 +367,7 @@ extern ProjectionInfo *ExecBuildUpdateProjection(List *targetList,
 												 TupleTableSlot *slot,
 												 PlanState *parent);
 extern ExprState *ExecPrepareExpr(Expr *node, EState *estate);
+extern ExprState *ExecPrepareExprSafe(Expr *node, EState *estate);
 extern ExprState *ExecPrepareQual(List *qual, EState *estate);
 extern ExprState *ExecPrepareCheck(List *qual, EState *estate);
 extern List *ExecPrepareExprList(List *nodes, EState *estate);