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The DECODE constructor in CaseExpr uses the same decodeExpr object when building the BinaryPredicates that compare the decodeExpr to each 'when' of the DECODE. This causes problems when different BinaryPredicates try to cast the same decodeExpr object to different types during analysis, in this case leading to a Precondition check failure. The solution is to clone the decodeExpr in the DECODE constructor in CaseExpr for each generated BinaryPredicate. Testing: - Added a regression test to exprs.test Change-Id: I4de9ed7118c8d18ec3f02ff74c9cca211c716e51 Reviewed-on: http://gerrit.cloudera.org:8080/5631 Reviewed-by: Marcel Kornacker <marcel@cloudera.com> Tested-by: Impala Public Jenkins
Welcome to Impala
Lightning-fast, distributed SQL queries for petabytes of data stored in Apache Hadoop clusters.
Impala is a modern, massively-distributed, massively-parallel, C++ query engine that lets you analyze, transform and combine data from a variety of data sources:
- Best of breed performance and scalability.
- Support for data stored in HDFS, Apache HBase and Amazon S3.
- Wide analytic SQL support, including window functions and subqueries.
- On-the-fly code generation using LLVM to generate CPU-efficient code tailored specifically to each individual query.
- Support for the most commonly-used Hadoop file formats, including the Apache Parquet (incubating) project.
- Apache-licensed, 100% open source.
More about Impala
To learn more about Impala as a business user, or to try Impala live or in a VM, please visit the Impala homepage.
If you are interested in contributing to Impala as a developer, or learning more about Impala's internals and architecture, visit the Impala wiki.
Supported Platforms
Impala only supports Linux at the moment.
Build Instructions
See bin/bootstrap_build.sh.
Export Control Notice
This distribution uses cryptographic software and may be subject to export controls. Please refer to EXPORT_CONTROL.md for more information.