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  1. Flink
  2. FLINK-10463

Null literal cannot be properly parsed in Java Table API function call

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      For example, the expression `Null(STRING).regexpReplace('oo|ar', '')` throws the following exception.

      org.apache.flink.table.api.ExpressionParserException: Could not parse expression at column 13: string matching regex `(?i)\Qas\E(?![_$\p{javaJavaIdentifierPart}])' expected but `.' found
      Null(STRING).regexpReplace('oo|ar', '')
                  ^
      
      	at org.apache.flink.table.expressions.ExpressionParser$.throwError(ExpressionParser.scala:576)
      	at org.apache.flink.table.expressions.ExpressionParser$.parseExpression(ExpressionParser.scala:569)
      

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            hequn8128 Hequn Cheng
            xccui Xingcan Cui
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