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[jira] [Created] (FLINK-10323) A single backslash cannot be successfully parsed in Java Table API


Xingcan Cui created FLINK-10323:
-----------------------------------

             Summary: A single backslash cannot be successfully parsed in Java Table API
                 Key: FLINK-10323
                 URL: https://issues.apache.org/jira/browse/FLINK-10323
             Project: Flink
          Issue Type: Bug
          Components: Table API & SQL
    Affects Versions: 1.6.0, 1.5.3, 1.4.2
            Reporter: Xingcan Cui


The snippet below will cause a parser exception.
{code:java}
 testAllApis(
      concat_ws("~", "AA", "\\"),
      "concat_ws('~','AA','\\')",
      "concat_ws('~','AA','\\\\')",
      "AA~\\")
{code}
{code}
org.apache.flink.table.api.ExpressionParserException: Could not parse expression at column 20: Invalid expression.
concat_ws('~','AA','\')
                   ^

	at org.apache.flink.table.expressions.ExpressionParser$.throwError(ExpressionParser.scala:549)
	at org.apache.flink.table.expressions.ExpressionParser$.parseExpression(ExpressionParser.scala:542)
	at org.apache.flink.table.expressions.utils.ExpressionTestBase.addTableApiTestExpr(ExpressionTestBase.scala:255)
	at org.apache.flink.table.expressions.utils.ExpressionTestBase.testAllApis(ExpressionTestBase.scala:265)
	at org.apache.flink.table.expressions.ScalarFunctionsTest.testConcatWs(ScalarFunctionsTest.scala:340)
{code}
However, with double (or more) backslashes, it will be successfully parsed.
{code:java}
testAllApis(
      concat_ws("~", "AA", "\\\\"),
      "concat_ws('~','AA','\\\\')",
      "concat_ws('~','AA','\\\\\\\\')",
      "AA~\\\\")
{code}



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