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Kent Yao 0df8dd6073 [SPARK-30352][SQL] DataSourceV2: Add CURRENT_CATALOG function 
### What changes were proposed in this pull request?

As we support multiple catalogs with DataSourceV2, we may need the `CURRENT_CATALOG` value expression from the SQL standard.

`CURRENT_CATALOG` is a general value specification in the SQL Standard, described as:

> The value specified by CURRENT_CATALOG is the character string that represents the current default catalog name.

### Why are the changes needed?
improve catalog v2 with ANSI SQL standard.

### Does this PR introduce any user-facing change?
yes, add a new function `current_catalog()` to point the current active catalog

### How was this patch tested?

add ut

Closes #27006 from yaooqinn/SPARK-30352.

Authored-by: Kent Yao <yaooqinn@hotmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2020-05-25 14:27:47 +00:00
..
catalyst [SPARK-30352][SQL] DataSourceV2: Add CURRENT_CATALOG function 2020-05-25 14:27:47 +00:00
core [SPARK-30352][SQL] DataSourceV2: Add CURRENT_CATALOG function 2020-05-25 14:27:47 +00:00
hive [SPARK-31684][SQL] Overwrite partition failed with 'WRONG FS' when the target partition is not belong to the filesystem as same as the table 2020-05-19 14:08:51 +00:00
hive-thriftserver Revert "[SPARK-31765][WEBUI] Upgrade HtmlUnit >= 2.37.0" 2020-05-21 16:00:58 -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

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.