diff --git a/expression/builtin_cast.go b/expression/builtin_cast.go
index 23df587a40bd5..545abd497a2da 100644
--- a/expression/builtin_cast.go
+++ b/expression/builtin_cast.go
@@ -469,7 +469,8 @@ func (b *castJSONAsArrayFunctionSig) evalJSON(row chunk.Row) (res types.BinaryJS
 	}
 
 	arrayVals := make([]any, 0, len(b.args))
-	f := convertJSON2Tp(b.tp.ArrayType())
+	ft := b.tp.ArrayType()
+	f := convertJSON2Tp(ft.EvalType())
 	if f == nil {
 		return types.BinaryJSON{}, false, ErrNotSupportedYet.GenWithStackByArgs("CAS-ing JSON to the target type")
 	}
@@ -486,7 +487,7 @@ func (b *castJSONAsArrayFunctionSig) evalJSON(row chunk.Row) (res types.BinaryJS
 		sc.TruncateAsWarning = originTruncateAsWarning
 	}()
 	for i := 0; i < val.GetElemCount(); i++ {
-		item, err := f(sc, val.ArrayGetElem(i))
+		item, err := f(sc, val.ArrayGetElem(i), ft)
 		if err != nil {
 			return types.BinaryJSON{}, false, err
 		}
@@ -495,31 +496,31 @@ func (b *castJSONAsArrayFunctionSig) evalJSON(row chunk.Row) (res types.BinaryJS
 	return types.CreateBinaryJSON(arrayVals), false, nil
 }
 
-func convertJSON2Tp(tp *types.FieldType) func(*stmtctx.StatementContext, types.BinaryJSON) (any, error) {
-	switch tp.EvalType() {
+func convertJSON2Tp(eval types.EvalType) func(*stmtctx.StatementContext, types.BinaryJSON, *types.FieldType) (any, error) {
+	switch eval {
 	case types.ETString:
-		return func(sc *stmtctx.StatementContext, item types.BinaryJSON) (any, error) {
+		return func(sc *stmtctx.StatementContext, item types.BinaryJSON, tp *types.FieldType) (any, error) {
 			if item.TypeCode != types.JSONTypeCodeString {
 				return nil, ErrInvalidJSONForFuncIndex
 			}
 			return types.ProduceStrWithSpecifiedTp(string(item.GetString()), tp, sc, false)
 		}
 	case types.ETInt:
-		return func(sc *stmtctx.StatementContext, item types.BinaryJSON) (any, error) {
+		return func(sc *stmtctx.StatementContext, item types.BinaryJSON, tp *types.FieldType) (any, error) {
 			if item.TypeCode != types.JSONTypeCodeInt64 && item.TypeCode != types.JSONTypeCodeUint64 {
 				return nil, ErrInvalidJSONForFuncIndex
 			}
 			return types.ConvertJSONToInt(sc, item, mysql.HasUnsignedFlag(tp.GetFlag()), tp.GetType())
 		}
 	case types.ETReal, types.ETDecimal:
-		return func(sc *stmtctx.StatementContext, item types.BinaryJSON) (any, error) {
+		return func(sc *stmtctx.StatementContext, item types.BinaryJSON, tp *types.FieldType) (any, error) {
 			if item.TypeCode != types.JSONTypeCodeInt64 && item.TypeCode != types.JSONTypeCodeUint64 && item.TypeCode != types.JSONTypeCodeFloat64 {
 				return nil, ErrInvalidJSONForFuncIndex
 			}
 			return types.ConvertJSONToFloat(sc, item)
 		}
 	case types.ETDatetime:
-		return func(sc *stmtctx.StatementContext, item types.BinaryJSON) (any, error) {
+		return func(sc *stmtctx.StatementContext, item types.BinaryJSON, tp *types.FieldType) (any, error) {
 			if (tp.GetType() == mysql.TypeDatetime && item.TypeCode != types.JSONTypeCodeDatetime) || (tp.GetType() == mysql.TypeDate && item.TypeCode != types.JSONTypeCodeDate) {
 				return nil, ErrInvalidJSONForFuncIndex
 			}
@@ -532,7 +533,7 @@ func convertJSON2Tp(tp *types.FieldType) func(*stmtctx.StatementContext, types.B
 			return res, nil
 		}
 	case types.ETDuration:
-		return func(sc *stmtctx.StatementContext, item types.BinaryJSON) (any, error) {
+		return func(sc *stmtctx.StatementContext, item types.BinaryJSON, tp *types.FieldType) (any, error) {
 			if item.TypeCode != types.JSONTypeCodeDuration {
 				return nil, ErrInvalidJSONForFuncIndex
 			}