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实现兼容MySQL SET自定义变量的功能

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This commit is contained in:
yuhuanhuan
2022-08-23 16:49:27 +08:00
parent 76a12fa14b
commit 06f316894d
41 changed files with 2396 additions and 25 deletions
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13
src/gausskernel/runtime/executor/execQual.cpp
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@ -1041,7 +1041,17 @@ static Datum ExecEvalWholeRowSlow(
*/
static Datum ExecEvalConst(ExprState* exprstate, ExprContext* econtext, bool* isNull, ExprDoneCond* isDone)
{
Const* con = (Const*)exprstate->expr;
Const* con = NULL;
if (IsA(exprstate->expr, UserVar)) {
bool found = false;
UserVar *uservar = (UserVar *)exprstate->expr;
GucUserParamsEntry *entry = (GucUserParamsEntry *)hash_search(u_sess->utils_cxt.set_user_params_htab, uservar->name, HASH_FIND, &found);
/* if not found, return a null const */
con = found ? entry->value : makeConst(UNKNOWNOID, -1, InvalidOid, -2, (Datum)0, true, false);
} else {
con = (Const*)exprstate->expr;
}
if (isDone != NULL)
*isDone = ExprSingleResult;
@ -5220,6 +5230,7 @@ ExprState* ExecInitExpr(Expr* node, PlanState* parent)
}
break;
case T_Const:
case T_UserVar:
state = (ExprState*)makeNode(ExprState);
state->evalfunc = ExecEvalConst;
break;