godfreyhe commented on a change in pull request #12431:
URL: https://github.com/apache/flink/pull/12431#discussion_r434321402



##########
File path: 
flink-table/flink-sql-client/src/main/java/org/apache/flink/table/client/cli/SqlCommandParser.java
##########
@@ -132,11 +132,10 @@ private SqlCommandParser() {
                        cmd = SqlCommand.DROP_CATALOG;
                } else if (operation instanceof UseCatalogOperation) {
                        cmd = SqlCommand.USE_CATALOG;
-                       operands = new String[] { String.format("`%s`", 
((UseCatalogOperation) operation).getCatalogName()) };
+                       operands = new String[] { ((UseCatalogOperation) 
operation).getCatalogName() };

Review comment:
       The quoting string ``` is skipped by sql parser, so we need not to 
handle this. see the test (`TestItem.validSql("use `default`;", SqlCommand.USE, 
"default")`) in `SqlCommandParserTest#testCommands` 

##########
File path: 
flink-table/flink-sql-client/src/main/java/org/apache/flink/table/client/cli/SqlCommandParser.java
##########
@@ -132,11 +132,10 @@ private SqlCommandParser() {
                        cmd = SqlCommand.DROP_CATALOG;
                } else if (operation instanceof UseCatalogOperation) {
                        cmd = SqlCommand.USE_CATALOG;
-                       operands = new String[] { String.format("`%s`", 
((UseCatalogOperation) operation).getCatalogName()) };
+                       operands = new String[] { ((UseCatalogOperation) 
operation).getCatalogName() };

Review comment:
       The quoting string ` ` ` is skipped by sql parser, so we need not to 
handle this. see the test (`TestItem.validSql("use `default`;", SqlCommand.USE, 
"default")`) in `SqlCommandParserTest#testCommands` 




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