slinkydeveloper commented on a change in pull request #17931:
URL: https://github.com/apache/flink/pull/17931#discussion_r759155865



##########
File path: 
flink-table/flink-table-planner/src/main/java/org/apache/flink/table/planner/delegation/ParserImpl.java
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@@ -64,6 +65,7 @@
     private final Supplier<CalciteParser> calciteParserSupplier;
     private final SqlExprToRexConverterFactory sqlExprToRexConverterFactory;
     private static final ExtendedParser EXTENDED_PARSER = 
ExtendedParser.INSTANCE;
+    private static final ExpressionParserImpl expressionParser = new 
ExpressionParserImpl();

Review comment:
       Sorry, that's a leftover of when i tried to move the funcionality inside 
the `Parser` iface




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