feat: Add Spark-compatible monthname function to datafusion-spark#21639
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JeelRajodiya wants to merge 1 commit intoapache:mainfrom
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feat: Add Spark-compatible monthname function to datafusion-spark#21639JeelRajodiya wants to merge 1 commit intoapache:mainfrom
monthname function to datafusion-spark#21639JeelRajodiya wants to merge 1 commit intoapache:mainfrom
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Implements `monthname(date_or_timestamp)` that returns the three-letter abbreviated month name (Jan, Feb, ..., Dec) from a date or timestamp, matching Apache Spark's behavior.
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Rationale
The
datafusion-sparkcrate is missing themonthnamefunction. Spark'smonthname(date)returns the three-letter abbreviated month name (Jan, Feb, ..., Dec) from a date or timestamp — commonly used in Spark SQL workloads.What changes are included in this PR?
Adds
SparkMonthNametodatafusion-spark's datetime functions. It usesarrow::compute::date_part(DatePart::Month)to extract the month number and maps it to the abbreviated name. The signature accepts Timestamp types with automatic coercion from Date32/Date64.Are these changes tested?
Yes — 6 unit tests covering scalar dates, array dates with nulls, null scalars, timestamp microseconds, all 12 months, and return field nullability.
Are there any user-facing changes?
New
monthnamescalar function available when usingdatafusion-spark.