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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