diff --git a/internal/endtoend/testdata/mysql_concat_type/mysql/db.go b/internal/endtoend/testdata/mysql_concat_type/mysql/db.go
new file mode 100644
index 0000000000..5770e0177f
--- /dev/null
+++ b/internal/endtoend/testdata/mysql_concat_type/mysql/db.go
@@ -0,0 +1,31 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+
+package mysql_concat_type
+
+import (
+	"context"
+	"database/sql"
+)
+
+type DBTX interface {
+	ExecContext(context.Context, string, ...interface{}) (sql.Result, error)
+	PrepareContext(context.Context, string) (*sql.Stmt, error)
+	QueryContext(context.Context, string, ...interface{}) (*sql.Rows, error)
+	QueryRowContext(context.Context, string, ...interface{}) *sql.Row
+}
+
+func New(db DBTX) *Queries {
+	return &Queries{db: db}
+}
+
+type Queries struct {
+	db DBTX
+}
+
+func (q *Queries) WithTx(tx *sql.Tx) *Queries {
+	return &Queries{
+		db: tx,
+	}
+}
diff --git a/internal/endtoend/testdata/mysql_concat_type/mysql/models.go b/internal/endtoend/testdata/mysql_concat_type/mysql/models.go
new file mode 100644
index 0000000000..653cf4cecf
--- /dev/null
+++ b/internal/endtoend/testdata/mysql_concat_type/mysql/models.go
@@ -0,0 +1,16 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+
+package mysql_concat_type
+
+import (
+	"time"
+)
+
+type Ticket struct {
+	ID           int64
+	TicketStatus int8
+	Title        string
+	CreatedAt    time.Time
+}
diff --git a/internal/endtoend/testdata/mysql_concat_type/mysql/query.sql.go b/internal/endtoend/testdata/mysql_concat_type/mysql/query.sql.go
new file mode 100644
index 0000000000..ea0ca77c90
--- /dev/null
+++ b/internal/endtoend/testdata/mysql_concat_type/mysql/query.sql.go
@@ -0,0 +1,69 @@
+// Code generated by sqlc. DO NOT EDIT.
+// versions:
+//   sqlc v1.30.0
+// source: query.sql
+
+package mysql_concat_type
+
+import (
+	"context"
+	"database/sql"
+	"time"
+)
+
+const getTickets = `-- name: GetTickets :many
+SELECT
+    id,
+    title,
+    ticket_status,
+    created_at
+FROM ticket
+WHERE (? IS NULL OR created_at >= ?)
+  AND (? IS NULL OR title LIKE CONCAT(?, '%'))
+ORDER BY id ASC
+`
+
+type GetTicketsParams struct {
+	StartTime   sql.NullTime
+	TitlePrefix sql.NullString
+}
+
+type GetTicketsRow struct {
+	ID           int64
+	Title        string
+	TicketStatus int8
+	CreatedAt    time.Time
+}
+
+func (q *Queries) GetTickets(ctx context.Context, arg GetTicketsParams) ([]GetTicketsRow, error) {
+	rows, err := q.db.QueryContext(ctx, getTickets,
+		arg.StartTime,
+		arg.StartTime,
+		arg.TitlePrefix,
+		arg.TitlePrefix,
+	)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var items []GetTicketsRow
+	for rows.Next() {
+		var i GetTicketsRow
+		if err := rows.Scan(
+			&i.ID,
+			&i.Title,
+			&i.TicketStatus,
+			&i.CreatedAt,
+		); err != nil {
+			return nil, err
+		}
+		items = append(items, i)
+	}
+	if err := rows.Close(); err != nil {
+		return nil, err
+	}
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+	return items, nil
+}
diff --git a/internal/endtoend/testdata/mysql_concat_type/query.sql b/internal/endtoend/testdata/mysql_concat_type/query.sql
new file mode 100644
index 0000000000..55467188cb
--- /dev/null
+++ b/internal/endtoend/testdata/mysql_concat_type/query.sql
@@ -0,0 +1,10 @@
+-- name: GetTickets :many
+SELECT
+    id,
+    title,
+    ticket_status,
+    created_at
+FROM ticket
+WHERE (sqlc.narg(start_time) IS NULL OR created_at >= sqlc.narg(start_time))
+  AND (sqlc.narg(title_prefix) IS NULL OR title LIKE CONCAT(sqlc.narg(title_prefix), '%'))
+ORDER BY id ASC;
diff --git a/internal/endtoend/testdata/mysql_concat_type/schema.sql b/internal/endtoend/testdata/mysql_concat_type/schema.sql
new file mode 100644
index 0000000000..a5d4a8de59
--- /dev/null
+++ b/internal/endtoend/testdata/mysql_concat_type/schema.sql
@@ -0,0 +1,7 @@
+CREATE TABLE ticket
+(
+    id                  BIGINT AUTO_INCREMENT PRIMARY KEY,
+    ticket_status       TINYINT      NOT NULL,
+    title               VARCHAR(255) NOT NULL,
+    created_at          DATETIME     NOT NULL DEFAULT CURRENT_TIMESTAMP
+);
diff --git a/internal/endtoend/testdata/mysql_concat_type/sqlc.json b/internal/endtoend/testdata/mysql_concat_type/sqlc.json
new file mode 100644
index 0000000000..07f953c248
--- /dev/null
+++ b/internal/endtoend/testdata/mysql_concat_type/sqlc.json
@@ -0,0 +1,16 @@
+{
+    "version": "2",
+    "sql": [
+        {
+            "engine": "mysql",
+            "queries": "query.sql",
+            "schema": "schema.sql",
+            "gen": {
+                "go": {
+                    "package": "mysql_concat_type",
+                    "out": "mysql"
+                }
+            }
+        }
+    ]
+}
diff --git a/internal/engine/dolphin/stdlib.go b/internal/engine/dolphin/stdlib.go
index 46ce500eb5..aa6dc30ad9 100644
--- a/internal/engine/dolphin/stdlib.go
+++ b/internal/engine/dolphin/stdlib.go
@@ -415,10 +415,10 @@ func defaultSchema(name string) *catalog.Schema {
 			Name: "CONCAT",
 			Args: []*catalog.Argument{
 				{
-					Type: &ast.TypeName{Name: "any"},
+					Type: &ast.TypeName{Name: "text"},
 				},
 				{
-					Type: &ast.TypeName{Name: "any"},
+					Type: &ast.TypeName{Name: "text"},
 					Mode: ast.FuncParamVariadic,
 				},
 			},