3b713e7f61
### What changes were proposed in this pull request? Currently, v2 ALTER TABLE ADD COLUMNS does not check duplicates for the user specified columns. For example, ``` spark.sql(s"CREATE TABLE $t (id int) USING $v2Format") spark.sql("ALTER TABLE $t ADD COLUMNS (data string, data string)") ``` doesn't fail the analysis, and it's up to the catalog implementation to handle it. For v1 command, the duplication is checked before invoking the catalog. ### Why are the changes needed? To check the duplicate columns during analysis and be consistent with v1 command. ### Does this PR introduce _any_ user-facing change? Yes, now the above will command will print out the fllowing: ``` org.apache.spark.sql.AnalysisException: Found duplicate column(s) in the user specified columns: `data` ``` ### How was this patch tested? Added new unit tests Closes #33600 from imback82/alter_add_duplicate_columns. Authored-by: Terry Kim <yuminkim@gmail.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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.. | ||
catalyst | ||
core | ||
hive | ||
hive-thriftserver | ||
create-docs.sh | ||
gen-sql-api-docs.py | ||
gen-sql-config-docs.py | ||
gen-sql-functions-docs.py | ||
mkdocs.yml | ||
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.