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Liang-Chi Hsieh 3aa933b162 [SPARK-36465][SS] Dynamic gap duration in session window 
### What changes were proposed in this pull request?

This patch supports dynamic gap duration in session window.

### Why are the changes needed?

The gap duration used in session window for now is a static value. To support more complex usage, it is better to support dynamic gap duration which determines the gap duration by looking at the current data. For example, in our usecase, we may have different gap by looking at the certain column in the input rows.

### Does this PR introduce _any_ user-facing change?

Yes, users can specify dynamic gap duration.

### How was this patch tested?

Modified existing tests and new test.

Closes #33691 from viirya/dynamic-session-window-gap.

Authored-by: Liang-Chi Hsieh <viirya@gmail.com>
Signed-off-by: Jungtaek Lim <kabhwan.opensource@gmail.com>
(cherry picked from commit 8b8d91cf64)
Signed-off-by: Jungtaek Lim <kabhwan.opensource@gmail.com>
2021-08-16 11:06:16 +09:00
..
catalyst [SPARK-36465][SS] Dynamic gap duration in session window 2021-08-16 11:06:16 +09:00
core [SPARK-36465][SS] Dynamic gap duration in session window 2021-08-16 11:06:16 +09:00
hive [SPARK-36421][SQL][DOCS] Use ConfigEntry.key to fix docs and set command results 2021-08-06 11:01:54 +09:00
hive-thriftserver [SPARK-36409][SQL][TESTS] Splitting test cases from datetime.sql 2021-08-06 12:55:31 +08:00
create-docs.sh
gen-sql-api-docs.py [SPARK-34747][SQL][DOCS] Add virtual operators to the built-in function document 2021-03-19 10:19:26 +09:00
gen-sql-config-docs.py [SPARK-32194][PYTHON] Use proper exception classes instead of plain Exception 2021-05-26 11:54:40 +09:00
gen-sql-functions-docs.py [SPARK-31562][SQL] Update ExpressionDescription for substring, current_date, and current_timestamp 2020-04-26 11:46:52 -07:00
mkdocs.yml
README.md

README.md

Spark SQL

This module provides support for executing relational queries expressed in either SQL or the DataFrame/Dataset API.

Spark SQL is broken up into four subprojects:

  • Catalyst (sql/catalyst) - An implementation-agnostic framework for manipulating trees of relational operators and expressions.
  • Execution (sql/core) - A query planner / execution engine for translating Catalyst's logical query plans into Spark RDDs. This component also includes a new public interface, SQLContext, that allows users to execute SQL or LINQ statements against existing RDDs and Parquet files.
  • Hive Support (sql/hive) - Includes extensions that allow users to write queries using a subset of HiveQL and access data from a Hive Metastore using Hive SerDes. There are also wrappers that allow users to run queries that include Hive UDFs, UDAFs, and UDTFs.
  • HiveServer and CLI support (sql/hive-thriftserver) - Includes support for the SQL CLI (bin/spark-sql) and a HiveServer2 (for JDBC/ODBC) compatible server.

Running ./sql/create-docs.sh generates SQL documentation for built-in functions under sql/site, and SQL configuration documentation that gets included as part of configuration.md in the main docs directory.