[KYUUBI #956] Fail to get table list if there is _ in schema's name

Just write some basic tests out in other projects.

Since this toJavaRegex is not a static function, which is hard to write unit test if don't move it out as  as static function in object.  (But in that case, the change may be too large for this).

### _How was this patch tested?_
- [x] Add some test cases that check the changes thoroughly including negative and positive cases if possible

- [ ] Add screenshots for manual tests if appropriate

- [x] [Run test](https://kyuubi.readthedocs.io/en/latest/develop_tools/testing.html#running-tests) locally before make a pull request

Closes #964 from Baoqi/bwu_fix_956.

Closes #956

985a73b5 [Baoqi Wu] [KYUUBI #956] add a unit test for this
cb111893 [Baoqi Wu] [KYUUBI #956] Fail to get table list if there is _ in schema's name

Authored-by: Baoqi Wu <wubaoqi@gmail.com>
Signed-off-by: Kent Yao <yao@apache.org>

externals/kyuubi-spark-sql-engine/src/main/scala/org/apache/kyuubi/engine/spark/operation/SparkOperation.scala

@@ -18,7 +18,6 @@
 package org.apache.kyuubi.engine.spark.operation
 
 import java.time.ZoneId
-import java.util.regex.Pattern
 
 import org.apache.commons.lang3.StringUtils
 import org.apache.hive.service.rpc.thrift.{TRowSet, TTableSchema}
@@ -62,6 +61,8 @@ abstract class SparkOperation(spark: SparkSession, opType: OperationType, sessio
    *
    * Underscores (_) are converted to '.' and percent signs (%) are converted to '.*'.
    *
+   * (referred to Spark's implementation: convertPattern function in file MetadataOperation.java)
+   *
    * @param input the SQL pattern to convert
    * @return the equivalent Java regular expression of the pattern
    */
@@ -71,19 +72,10 @@ abstract class SparkOperation(spark: SparkSession, opType: OperationType, sessio
     } else {
       input
     }
-    val in = res.toIterator
-    val out = new StringBuilder()
-
-    while (in.hasNext) {
-      in.next match {
-        case c if c == '\\' && in.hasNext => Pattern.quote(Character.toString(in.next()))
-        case c if c == '\\' && !in.hasNext => Pattern.quote(Character.toString(c))
-        case '_' => out ++= "."
-        case '%' => out ++= ".*"
-        case c => out ++= Character.toString(c)
-      }
-    }
-    out.result()
+    val wStr = ".*"
+    res
+      .replaceAll("([^\\\\])%", "$1" + wStr).replaceAll("\\\\%", "%").replaceAll("^%", wStr)
+      .replaceAll("([^\\\\])_", "$1.").replaceAll("\\\\_", "_").replaceAll("^_", ".")
   }
 
   protected def onError(cancel: Boolean = false): PartialFunction[Throwable, Unit] = {

kyuubi-common/src/test/scala/org/apache/kyuubi/operation/BasicJDBCTests.scala

@@ -53,6 +53,8 @@ trait BasicJDBCTests extends JDBCTestUtils {
 
       checkGetSchemas(metaData.getSchemas(catalog, "db1"), Seq("db1"), catalog)
       checkGetSchemas(metaData.getSchemas(catalog, "db_not_exist"), Seq.empty, catalog)
+
+      checkGetSchemas(metaData.getSchemas(catalog, "global\\_temp"), Seq("global_temp"), catalog)
     }
   }