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https://issues.apache.org/jira/browse/FLINK-10323?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16611867#comment-16611867
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Timo Walther commented on FLINK-10323:
--------------------------------------
[~xccui] does my PR also solve your issue?
> 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: 1.4.2, 1.5.3, 1.6.0
> Reporter: Xingcan Cui
> Priority: Major
>
> 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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