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Dongjoon Hyun 17cdabb887 [SPARK-19809][SQL][TEST] NullPointerException on zero-size ORC file 
## What changes were proposed in this pull request?

Until 2.2.1, Spark raises `NullPointerException` on zero-size ORC files. Usually, these zero-size ORC files are generated by 3rd-party apps like Flume.

```scala
scala> sql("create table empty_orc(a int) stored as orc location '/tmp/empty_orc'")

$ touch /tmp/empty_orc/zero.orc

scala> sql("select * from empty_orc").show
java.lang.RuntimeException: serious problem at
org.apache.hadoop.hive.ql.io.orc.OrcInputFormat.generateSplitsInfo(OrcInputFormat.java:1021)
...
Caused by: java.lang.NullPointerException at
org.apache.hadoop.hive.ql.io.orc.OrcInputFormat$BISplitStrategy.getSplits(OrcInputFormat.java:560)
```

After [SPARK-22279](https://github.com/apache/spark/pull/19499), Apache Spark with the default configuration doesn't have this bug. Although Hive 1.2.1 library code path still has the problem, we had better have a test coverage on what we have now in order to prevent future regression on it.

## How was this patch tested?

Pass a newly added test case.

Author: Dongjoon Hyun <dongjoon@apache.org>

Closes #19948 from dongjoon-hyun/SPARK-19809-EMPTY-FILE.
2017-12-13 07:42:24 +09:00
..
catalyst [SPARK-21322][SQL] support histogram in filter cardinality estimation 2017-12-12 15:04:49 +08:00
core [SPARK-22729][SQL] Add getTruncateQuery to JdbcDialect 2017-12-12 10:41:37 -08:00
hive [SPARK-19809][SQL][TEST] NullPointerException on zero-size ORC file 2017-12-13 07:42:24 +09:00
hive-thriftserver Revert "[SPARK-22496][SQL] thrift server adds operation logs" 2017-12-11 13:08:42 -08:00
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-21485][FOLLOWUP][SQL][DOCS] Describes examples and arguments separately, and note/since in SQL built-in function documentation 2017-08-05 10:10:56 -07:00
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-21485][SQL][DOCS] Spark SQL documentation generation for built-in functions 2017-07-26 09:38:51 -07:00

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 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.

Running sql/create-docs.sh generates SQL documentation for built-in functions under sql/site.