There are a few Operations in Cascading (e.g.,
ExpressionFilter) that compile and apply Java
expressions on the fly. In these expressions, Operation argument field
names are used as variable names in the expression. For this reason,
take care to create field names that don't contain characters which will
cause compilation errors if they are used in an expression. For example,
"first-name" is a valid field name for use with Cascading, but might
result in the expression
first-name.trim(), which will cause
a compilation error.
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