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Kent Yao f926809a1f [SPARK-29390][SQL] Add the justify_days(), justify_hours() and justif_interval() functions 
### What changes were proposed in this pull request?

Add 3 interval functions justify_days, justify_hours, justif_interval to support justify interval values

### Why are the changes needed?

For feature parity with postgres

add three interval functions to justify interval values.

justify_days(interval) | interval | Adjust interval so 30-day time periods are represented as months | justify_days(interval '35 days') | 1 mon 5 days
-- | -- | -- | -- | --
justify_hours(interval) | interval | Adjust interval so 24-hour time periods are represented as days | justify_hours(interval '27 hours') | 1 day 03:00:00
justify_interval(interval) | interval | Adjust interval using justify_days and justify_hours, with additional sign adjustments | justify_interval(interval '1 mon -1 hour') | 29 days 23:00:00

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

yes. new interval functions are added

### How was this patch tested?

add ut

Closes #26465 from yaooqinn/SPARK-29390.

Authored-by: Kent Yao <yaooqinn@hotmail.com>
Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org>
2019-11-13 15:04:39 +09:00
..
catalyst [SPARK-29390][SQL] Add the justify_days(), justify_hours() and justif_interval() functions 2019-11-13 15:04:39 +09:00
core [SPARK-29390][SQL] Add the justify_days(), justify_hours() and justif_interval() functions 2019-11-13 15:04:39 +09:00
hive [SPARK-29421][SQL] Supporting Create Table Like Using Provider 2019-11-11 15:25:56 +08:00
hive-thriftserver [SPARK-29601][WEBUI] JDBC ODBC Tab Statement column provide ellipsis for big SQL statement 2019-11-10 13:08:26 -06:00
create-docs.sh [MINOR][DOCS] Minor doc fixes related with doc build and uses script dir in SQL doc gen script 2017-08-26 13:56:24 +09:00
gen-sql-markdown.py [SPARK-27328][SQL] Add 'deprecated' in ExpressionDescription for extended usage and SQL doc 2019-04-09 13:49:42 +08:00
mkdocs.yml [SPARK-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00
README.md [SPARK-28980][CORE][SQL][STREAMING][MLLIB] Remove most items deprecated in Spark 2.2.0 or earlier, for Spark 3 2019-09-09 10:19:40 -05:00

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.