Column-like argument accepted by the string functions in this module.
A plain string is treated as a STRING LITERAL VALUE (it will be quoted
and escaped, e.g. 'hello'), NOT as a column name. To reference a
column, wrap it with col('columnName').
ColExpression (from col()), FnExpression (from fn()), and
LiteralExpression (from literalExpr()) are rendered as SQL
expressions/identifiers, not quoted as literal text.
Column-like argument accepted by the string functions in this module.
stringis treated as a STRING LITERAL VALUE (it will be quoted and escaped, e.g.'hello'), NOT as a column name. To reference a column, wrap it withcol('columnName').ColExpression(fromcol()),FnExpression(fromfn()), andLiteralExpression(fromliteralExpr()) are rendered as SQL expressions/identifiers, not quoted as literal text.