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misc: Support date_format Spark function by simply reusing a Presto function #11953

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misc: Support date_format Spark function by simply reusing a Presto function #11953

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PHILO-HE Dec 24, 2024
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PHILO-HE Dec 25, 2024
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7 changes: 7 additions & 0 deletions velox/docs/functions/spark/datetime.rst
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Original file line number Diff line number Diff line change
Expand Up @@ -34,6 +34,13 @@ These functions support TIMESTAMP and DATE input types.
deducted from ``start_date``.
Supported types for ``num_days`` are: TINYINT, SMALLINT, INTEGER.

.. spark:function:: date_format(timestamp, dateFormat) -> string

Converts `timestamp` to a string in the format specified by `dateFormat`.

SELECT date_format('2020-01-29', 'yyyy'); -- '2020'
SELECT date_format('2024-05-30 08:00:00', 'yyyy-MM-dd'); -- '2024-05-30'

.. spark:function:: date_from_unix_date(integer) -> date

Creates date from the number of days since 1970-01-01 in either direction. Returns null when input is null.
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2 changes: 2 additions & 0 deletions velox/functions/sparksql/registration/RegisterDatetime.cpp
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Expand Up @@ -52,6 +52,8 @@ void registerDatetimeFunctions(const std::string& prefix) {
registerFunction<DateAddFunction, Date, Date, int8_t>({prefix + "date_add"});
registerFunction<DateAddFunction, Date, Date, int16_t>({prefix + "date_add"});
registerFunction<DateAddFunction, Date, Date, int32_t>({prefix + "date_add"});
registerFunction<FormatDateTimeFunction, Varchar, Timestamp, Varchar>(
{prefix + "date_format"});
registerFunction<DateFromUnixDateFunction, Date, int32_t>(
{prefix + "date_from_unix_date"});
registerFunction<DateSubFunction, Date, Date, int8_t>({prefix + "date_sub"});
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