planner: Removed check for prepared stmt during partition pruning (#5…

…5631)

close #55630

pkg/planner/core/rule_partition_processor.go

@@ -1584,13 +1584,6 @@ func (p *rangePruner) extractDataForPrune(sctx base.PlanContext, expr expression
 		// If the partition expression is col, use constExpr.
 		constExpr = con
 	}
-	// If the partition expression is related with more than one columns such as 'a + b' or 'a * b' or something else,
-	// the constExpr may not a really constant when coming here.
-	// Suppose the partition expression is 'a + b' and we have a condition 'a = 2',
-	// the constExpr is '2 + b' after the replacement which we can't evaluate.
-	if !expression.ConstExprConsiderPlanCache(constExpr, sctx.GetSessionVars().StmtCtx.UseCache()) {
-		return ret, false
-	}
 	c, isNull, err := constExpr.EvalInt(sctx.GetExprCtx().GetEvalCtx(), chunk.Row{})
 	if err == nil && !isNull {
 		ret.c = c