branch-4.1:[fix](case)fix maxcompute p2 case. (#62421)

### What problem does this PR solve?

Problem Summary:
just fix case.

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Author: hubgeter

regression-test/suites/external_table_p2/maxcompute/write/test_mc_write_ctas.groovy

@@ -44,6 +44,8 @@ suite("test_mc_write_ctas", "p2,external,maxcompute,external_remote,external_rem
 
     def uuid = UUID.randomUUID().toString().replace("-", "").substring(0, 8)
     String db = "mc_write_ctas_${uuid}"
+    String internal_db = "mc_ctas_internal_${uuid}"
+    String internal_tb = "ctas_internal_src_${uuid}"
 
     sql """drop database if exists ${db}"""
     sql """create database ${db}"""
@@ -99,8 +101,6 @@ suite("test_mc_write_ctas", "p2,external,maxcompute,external_remote,external_rem
         order_qt_ctas_agg """ SELECT * FROM ${tb5} """
 
         // Test 6: CTAS from internal catalog (cross-catalog)
-        String internal_db = "mc_ctas_internal_${uuid}"
-        String internal_tb = "ctas_internal_src_${uuid}"
         sql """CREATE DATABASE IF NOT EXISTS internal.${internal_db}"""
         sql """DROP TABLE IF EXISTS internal.${internal_db}.${internal_tb}"""
         sql """