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https://issues.apache.org/jira/browse/SPARK-57550?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Max Gekk updated SPARK-57550:
-----------------------------
Description:
Umbrella for follow-up work extending support for the TIME data type (TimeType)
introduced by the SPIP SPARK-51162. Collects TIME-related tasks such as casts
to/from other types, columnar/Arrow support, Parquet/Variant interop, and
statistics collection.
h2. Prioritization
Suggested ordering of the open sub-tasks by dependency, correctness impact,
ANSI/user value, and existing momentum (open PRs).
h3. Dependencies / blockers
* SPARK-57551 (TIME precision -> 9) is the only hard in-umbrella blocker: it
gates SPARK-57552 and SPARK-57554.
* SPARK-57552 and SPARK-57554 additionally depend on the nanosecond TIMESTAMP
types (TimestampNTZNanosType / TimestampLTZNanos), tracked outside this
umbrella.
h3. Tier 1 - do first (correctness gaps; small, no dependencies)
TIME currently throws/fails in these paths, so they behave like bugs:
* SPARK-54203 - RowToColumnConverter: TIME hits unsupportedDataTypeError in
row->column conversion (caching/vectorized paths). Best single first ticket.
* SPARK-54582 - stats serialization: CatalogColumnStat.toExternalString throws
for TIME, so ANALYZE TABLE min/max persistence is broken.
* SPARK-57559 - add a TimeType case to PhysicalDataType: trivial robustness fix.
h3. Tier 2 - high ANSI/user value, no deps, momentum (PRs exist)
* SPARK-52617 - TIME <-> TIMESTAMP_NTZ (micros): ANSI-mandatory cast, highest
everyday value (PR open).
* SPARK-54281 - numeric -> TIME: completes cast symmetry (PR open).
* SPARK-57553 - TIME <-> TIMESTAMP_LTZ (micros): finishes the ANSI cast matrix
for the common timestamp type.
* SPARK-52621 - TIME <-> VARIANT (PR open); needs the encoding decision first.
h3. Tier 3 - foundational enabler for the nanosecond line
* SPARK-57551 - precision -> 9: highest-leverage enabler; unblocks SPARK-57552
/ SPARK-57554 and aligns TIME with the in-flight nanos TIMESTAMP work and
ANSI's "TIME and TIMESTAMP share the same max precision" rule. Start early if
the nanosecond direction is a release priority.
* Then SPARK-57552 and SPARK-57554 once 57551 and the nanos TIMESTAMP types are
in.
h3. Tier 4 - valuable but independent / can run anytime
* SPARK-57555 - JDBC data source: biggest migration payoff (the SPIP
motivation), but a larger multi-dialect effort; parallelize on its own track.
* SPARK-54507 - time_bucket (PR open), SPARK-57558 - LOCALTIME (small, ANSI),
SPARK-57557 - quantile/sketch aggregates.
h3. Tier 5 - lower priority / niche / polish
* SPARK-53368 - Parquet isAdjustedToUTC=true (PR open, minor), SPARK-57560 -
TRY-mode arithmetic, SPARK-57556 - Hive interop (Hive has no TIME; mostly a
documented-limitation task), SPARK-51403 - ordered/atomic tests (starter), and
docs SPARK-57030 / SPARK-57031 (do last, once behavior is settled).
h3. Bottom line
* Implement first: SPARK-54203 (smallest, no deps, closes a real failure path).
* In parallel, kick off: SPARK-57551 (foundational blocker for the nanosecond
cast branch).
* Then drive to done: the ANSI cast tickets with existing PRs (SPARK-52617,
SPARK-54281).
was:Umbrella for follow-up work extending support for the TIME data type
(TimeType) introduced by the SPIP SPARK-51162. Collects TIME-related tasks such
as casts to/from other types, columnar/Arrow support, Parquet/Variant interop,
and statistics collection.
> Extend support for the TIME data type
> -------------------------------------
>
> Key: SPARK-57550
> URL: https://issues.apache.org/jira/browse/SPARK-57550
> Project: Spark
> Issue Type: Umbrella
> Components: SQL
> Affects Versions: 4.3.0
> Reporter: Max Gekk
> Assignee: Max Gekk
> Priority: Major
>
> Umbrella for follow-up work extending support for the TIME data type
> (TimeType) introduced by the SPIP SPARK-51162. Collects TIME-related tasks
> such as casts to/from other types, columnar/Arrow support, Parquet/Variant
> interop, and statistics collection.
> h2. Prioritization
> Suggested ordering of the open sub-tasks by dependency, correctness impact,
> ANSI/user value, and existing momentum (open PRs).
> h3. Dependencies / blockers
> * SPARK-57551 (TIME precision -> 9) is the only hard in-umbrella blocker: it
> gates SPARK-57552 and SPARK-57554.
> * SPARK-57552 and SPARK-57554 additionally depend on the nanosecond TIMESTAMP
> types (TimestampNTZNanosType / TimestampLTZNanos), tracked outside this
> umbrella.
> h3. Tier 1 - do first (correctness gaps; small, no dependencies)
> TIME currently throws/fails in these paths, so they behave like bugs:
> * SPARK-54203 - RowToColumnConverter: TIME hits unsupportedDataTypeError in
> row->column conversion (caching/vectorized paths). Best single first ticket.
> * SPARK-54582 - stats serialization: CatalogColumnStat.toExternalString
> throws for TIME, so ANALYZE TABLE min/max persistence is broken.
> * SPARK-57559 - add a TimeType case to PhysicalDataType: trivial robustness
> fix.
> h3. Tier 2 - high ANSI/user value, no deps, momentum (PRs exist)
> * SPARK-52617 - TIME <-> TIMESTAMP_NTZ (micros): ANSI-mandatory cast, highest
> everyday value (PR open).
> * SPARK-54281 - numeric -> TIME: completes cast symmetry (PR open).
> * SPARK-57553 - TIME <-> TIMESTAMP_LTZ (micros): finishes the ANSI cast
> matrix for the common timestamp type.
> * SPARK-52621 - TIME <-> VARIANT (PR open); needs the encoding decision first.
> h3. Tier 3 - foundational enabler for the nanosecond line
> * SPARK-57551 - precision -> 9: highest-leverage enabler; unblocks
> SPARK-57552 / SPARK-57554 and aligns TIME with the in-flight nanos TIMESTAMP
> work and ANSI's "TIME and TIMESTAMP share the same max precision" rule. Start
> early if the nanosecond direction is a release priority.
> * Then SPARK-57552 and SPARK-57554 once 57551 and the nanos TIMESTAMP types
> are in.
> h3. Tier 4 - valuable but independent / can run anytime
> * SPARK-57555 - JDBC data source: biggest migration payoff (the SPIP
> motivation), but a larger multi-dialect effort; parallelize on its own track.
> * SPARK-54507 - time_bucket (PR open), SPARK-57558 - LOCALTIME (small, ANSI),
> SPARK-57557 - quantile/sketch aggregates.
> h3. Tier 5 - lower priority / niche / polish
> * SPARK-53368 - Parquet isAdjustedToUTC=true (PR open, minor), SPARK-57560 -
> TRY-mode arithmetic, SPARK-57556 - Hive interop (Hive has no TIME; mostly a
> documented-limitation task), SPARK-51403 - ordered/atomic tests (starter),
> and docs SPARK-57030 / SPARK-57031 (do last, once behavior is settled).
> h3. Bottom line
> * Implement first: SPARK-54203 (smallest, no deps, closes a real failure
> path).
> * In parallel, kick off: SPARK-57551 (foundational blocker for the nanosecond
> cast branch).
> * Then drive to done: the ANSI cast tickets with existing PRs (SPARK-52617,
> SPARK-54281).
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