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Terry Kim e75d9afb2f [SPARK-30094][SQL] Apply current namespace for the single-part table name 
### What changes were proposed in this pull request?

This PR applies the current namespace for the single-part table name if the current catalog is a non-session catalog.

Note that the reason the current namespace is not applied for the session catalog is that the single-part name could be referencing a temp view which doesn't belong to any namespaces. The empty namespace for a table inside the session catalog is resolved by the session catalog implementation.

### Why are the changes needed?

It's fixing the following bug where the current namespace is not respected:
```
sql("CREATE TABLE testcat.ns.t USING foo AS SELECT 1 AS id")
sql("USE testcat.ns")
sql("SHOW CURRENT NAMESPACE").show
+-------+---------+
|catalog|namespace|
+-------+---------+
|testcat|       ns|
+-------+---------+

// `t` is not resolved since the current namespace `ns` is not used.
sql("DESCRIBE t").show
Failed to analyze query: org.apache.spark.sql.AnalysisException: Table not found: t;;
```

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

Yes, the above `DESCRIBE` command will succeed.

### How was this patch tested?

Added tests.

Closes #26894 from imback82/current_namespace.

Authored-by: Terry Kim <yuminkim@gmail.com>
Signed-off-by: Wenchen Fan <wenchen@databricks.com>
2019-12-17 11:13:27 +08:00
..
catalyst [SPARK-30094][SQL] Apply current namespace for the single-part table name 2019-12-17 11:13:27 +08:00
core [SPARK-30094][SQL] Apply current namespace for the single-part table name 2019-12-17 11:13:27 +08:00
hive [INFRA] Reverts commit 56dcd79 and c216ef1 2019-12-16 19:57:44 -07:00
hive-thriftserver [INFRA] Reverts commit 56dcd79 and c216ef1 2019-12-16 19:57:44 -07:00
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.