spark-instrumented-optimizer/sql
Jungtaek Lim (HeartSaVioR) 542aefb4c4 [SPARK-31985][SS] Remove incomplete/undocumented stateful aggregation in continuous mode
### What changes were proposed in this pull request?

This removes the undocumented and incomplete feature of "stateful aggregation" in continuous mode, which would reduce 1100+ lines of code.

### Why are the changes needed?

The work for the feature had been stopped for over an year, and no one asked/requested for the availability of such feature in community. Current state for the feature is that it only works with `coalesce(1)` which force the query to read and process, and write in "a" task, which doesn't make sense in production.

The remaining code increases the work on DSv2 changes as well - that's why I don't simply propose reverting relevant commits - the code path has been changed due to DSv2 evolution.

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

Technically no, because it's never documented and can't be used in production in current shape.

### How was this patch tested?

Existing tests.

Closes #29077 from HeartSaVioR/SPARK-31985.

Authored-by: Jungtaek Lim (HeartSaVioR) <kabhwan.opensource@gmail.com>
Signed-off-by: Jungtaek Lim (HeartSaVioR) <kabhwan.opensource@gmail.com>
2020-07-15 13:40:43 +09:00
..
catalyst [SPARK-31985][SS] Remove incomplete/undocumented stateful aggregation in continuous mode 2020-07-15 13:40:43 +09:00
core [SPARK-31985][SS] Remove incomplete/undocumented stateful aggregation in continuous mode 2020-07-15 13:40:43 +09:00
hive [SPARK-32138] Drop Python 2.7, 3.4 and 3.5 2020-07-14 11:22:44 +09:00
hive-thriftserver [SPARK-32004][ALL] Drop references to slave 2020-07-13 14:05:33 -07:00
create-docs.sh [SPARK-31550][SQL][DOCS] Set nondeterministic configurations with general meanings in sql configuration doc 2020-04-27 17:08:52 +09:00
gen-sql-api-docs.py [SPARK-31474][SQL][FOLLOWUP] Replace _FUNC_ placeholder with functionname in the note field of expression info 2020-04-23 13:33:04 +09:00
gen-sql-config-docs.py [SPARK-31550][SQL][DOCS] Set nondeterministic configurations with general meanings in sql configuration doc 2020-04-27 17:08:52 +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 [SPARK-30731] Update deprecated Mkdocs option 2020-02-19 17:28:58 +09:00
README.md [SPARK-30510][SQL][DOCS] Publicly document Spark SQL configuration options 2020-02-09 19:20:47 +09:00

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.