2f7461f313
## What changes were proposed in this pull request? This PR corrects several partition related behaviors of `ExternalCatalog`: 1. default partition location should not always lower case the partition column names in path string(fix `HiveExternalCatalog`) 2. rename partition should not always lower case the partition column names in updated partition path string(fix `HiveExternalCatalog`) 3. rename partition should update the partition location only for managed table(fix `InMemoryCatalog`) 4. create partition with existing directory should be fine(fix `InMemoryCatalog`) 5. create partition with non-existing directory should create that directory(fix `InMemoryCatalog`) 6. drop partition from external table should not delete the directory(fix `InMemoryCatalog`) ## How was this patch tested? new tests in `ExternalCatalogSuite` Author: Wenchen Fan <wenchen@databricks.com> Closes #15797 from cloud-fan/partition. |
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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 an extension of SQLContext called HiveContext that allows users to write queries using a subset of HiveQL and access data from a Hive Metastore using Hive SerDes. There are also wrappers that allows 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.