Syleechan commented on code in PR #7042: URL: https://github.com/apache/arrow-datafusion/pull/7042#discussion_r1274303313
########## docs/source/user-guide/sql/scalar_functions.md: ########## @@ -507,14 +507,17 @@ tanh(numeric_expression) Truncates a number toward zero (at the decimal point). ``` -trunc(numeric_expression) +trunc(numeric_expression[, decimal_places]) ``` #### Arguments - **numeric_expression**: Numeric expression to operate on. Can be a constant, column, or function, and any combination of arithmetic operators. +- **decimal_places**: Optional. The number of decimal places to truncate to. + Defaults to 0. Review Comment: > can not be negative, modify the trunc function just meet the self-defined precision of decimal to '.' ########## datafusion/core/tests/sqllogictests/test_files/scalar.slt: ########## @@ -918,6 +918,15 @@ select trunc(4.267, 3), trunc(1.1234, 2), trunc(-1.1231, 6), trunc(1.2837284, 2) ---- 4.267 1.12 -1.1231 1.28 1 +# trunc with columns and precision +query RRR rowsort +select trunc(a, 3) as a3, trunc(a, 1) as a1, trunc(arrow_cast(a, 'Float64'), 3) as a3_f64 from small_floats; +---- +-0.7 -0.7 -0.7 +-1 -1 -1 +0.2 0.2 0.2 +0.5 0.5 0.5 Review Comment: maybe add some long decimal point float number -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
