Function compileExpression

Compile a scalar expression to SQL.

compileExpression(dialect, 'email');                    // "email"
compileExpression(dialect, col('email'));               // "email"
compileExpression(dialect, fn('LOWER', col('email')));  // LOWER("email")
compileExpression(dialect, cast(col('id'), 'TEXT'));    // CAST("id" AS TEXT)
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