d315ebf3a7
### What changes were proposed in this pull request? When using `Seconds.toMicros` API to convert epoch seconds to microseconds, ```scala /** * Equivalent to * {link #convert(long, TimeUnit) MICROSECONDS.convert(duration, this)}. * param duration the duration * return the converted duration, * or {code Long.MIN_VALUE} if conversion would negatively * overflow, or {code Long.MAX_VALUE} if it would positively overflow. */ ``` This PR change it to `Math.multiplyExact(epochSeconds, MICROS_PER_SECOND)` ### Why are the changes needed? fix silent data change between 3.x and 2.x ``` ~/Downloads/spark/spark-3.1.0-SNAPSHOT-bin-20200722 bin/spark-sql -S -e "select to_timestamp('300000', 'y');" +294247-01-10 12:00:54.775807 ``` ``` kentyaohulk ~/Downloads/spark/spark-2.4.5-bin-hadoop2.7 bin/spark-sql -S -e "select to_timestamp('300000', 'y');" 284550-10-19 15:58:1010.448384 ``` ### Does this PR introduce _any_ user-facing change? Yes, we will raise `ArithmeticException` instead of giving the wrong answer if overflow. ### How was this patch tested? add unit test Closes #29220 from yaooqinn/SPARK-32424. Authored-by: Kent Yao <yaooqinn@hotmail.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.