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https://issues.apache.org/jira/browse/SPARK-18952?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Burak Yavuz updated SPARK-18952:
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Summary: regex strings not properly escaped in codegen for aggregations
(was: regex strings not properly escaped in codegen)
> regex strings not properly escaped in codegen for aggregations
> --------------------------------------------------------------
>
> Key: SPARK-18952
> URL: https://issues.apache.org/jira/browse/SPARK-18952
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.0.2
> Reporter: Burak Yavuz
>
> If I use the function regexp_extract, and then in my regex string, use `\`,
> i.e. escape character, this fails codegen, because the `\` character is not
> properly escaped when codegen'd.
> Example stack trace:
> {code}
> /* 059 */ private int maxSteps = 2;
> /* 060 */ private int numRows = 0;
> /* 061 */ private org.apache.spark.sql.types.StructType keySchema = new
> org.apache.spark.sql.types.StructType().add("date_format(window#325.start,
> yyyy-MM-dd HH:mm)", org.apache.spark.sql.types.DataTypes.StringType)
> /* 062 */ .add("regexp_extract(source#310.description, ([a-zA-Z]+)\[.*,
> 1)", org.apache.spark.sql.types.DataTypes.StringType);
> /* 063 */ private org.apache.spark.sql.types.StructType valueSchema = new
> org.apache.spark.sql.types.StructType().add("sum",
> org.apache.spark.sql.types.DataTypes.LongType);
> /* 064 */ private Object emptyVBase;
> ...
> org.codehaus.commons.compiler.CompileException: File 'generated.java', Line
> 62, Column 58: Invalid escape sequence
> at org.codehaus.janino.Scanner.scanLiteralCharacter(Scanner.java:918)
> at org.codehaus.janino.Scanner.produce(Scanner.java:604)
> at org.codehaus.janino.Parser.peekRead(Parser.java:3239)
> at org.codehaus.janino.Parser.parseArguments(Parser.java:3055)
> at org.codehaus.janino.Parser.parseSelector(Parser.java:2914)
> at org.codehaus.janino.Parser.parseUnaryExpression(Parser.java:2617)
> at
> org.codehaus.janino.Parser.parseMultiplicativeExpression(Parser.java:2573)
> at org.codehaus.janino.Parser.parseAdditiveExpression(Parser.java:2552)
> {code}
> In the codegend expression, the literal should use `\\` instead of `\`
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