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https://issues.apache.org/jira/browse/SPARK-30795?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Hyukjin Kwon reassigned SPARK-30795:
------------------------------------
Assignee: Kris Mok
> Spark SQL codegen's code() interpolator should treat escapes like Scala's
> StringContext.s()
> -------------------------------------------------------------------------------------------
>
> Key: SPARK-30795
> URL: https://issues.apache.org/jira/browse/SPARK-30795
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.4.0, 2.4.1, 2.4.2, 2.4.3, 2.4.4, 2.4.5, 3.0.0
> Reporter: Kris Mok
> Assignee: Kris Mok
> Priority: Major
> Fix For: 3.1.0
>
>
> The {{code()}} string interpolator in Spark SQL's code generator should treat
> escapes like Scala's builtin {{StringContext.s()}} interpolator, i.e. it
> should treat escapes in the code parts, and should not treat escapes in the
> input arguments.
> For example,
> {code}
> val arg = "This is an argument."
> val str = s"This is string part 1. $arg This is string part 2."
> val code = code"This is string part 1. $arg This is string part 2."
> assert(code.toString == str)
> {code}
> We should expect the {{code()}} interpolator produce the same thing as the
> {{StringContext.s()}} interpolator, where only escapes in the string parts
> should be treated, while the args should be kept verbatim.
> But in the current implementation, due to the eager folding of code parts and
> literal input args, the escape treatment is incorrectly done on both code
> parts and literal args.
> That causes a problem when an arg contains escape sequences and wants to
> preserve that in the final produced code string. For example, in {{Like}}
> expression's codegen, there's an ugly workaround for this bug:
> {code}
> // We need double escape to avoid
> org.codehaus.commons.compiler.CompileException.
> // '\\' will cause exception 'Single quote must be backslash-escaped in
> character literal'.
> // '\"' will cause exception 'Line break in literal not allowed'.
> val newEscapeChar = if (escapeChar == '\"' || escapeChar == '\\') {
> s"""\\\\\\$escapeChar"""
> } else {
> escapeChar
> }
> {code}
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