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[6.40] [df] Consider quoted strings in collection size short syntax - #23826
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The regex pattern present before was not refined enough to consider the case where the target #varname could happen to be within a quoted string. Improve the regex pattern in ParseRDFExpression and add a more complicated test case in dataframe_interface.cxx Fixes root-project#23790 (cherry picked from commit cb1b496)
Also add a test where the user defines a column of type std::string with a value that could be ambiguous w.r.t. the short syntax for collection sizes. RDataFrame should not substitute the string value in this case, it should be returned as-is to downstream actions. Co-authored-by: muntasir-396 <muntasirmamun396@gmail.com> (cherry picked from commit c4011b2)
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October 24, 2026 09:39
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Backport of #23804, requested by @vepadulano.