07a5716773
Tuple cache correctness verification is failing as the code in debug-util.cc used for printing the text version of tuples does not support printing structs. It hits a DCHECK and kills Impala. This adds supports for printing structs to debug-util.cc, fixing tuple cache correctness verification for complex types. To print structs correctly, each slot needs to know its field name. The ColumnType has this information, but it requires a field idx to lookup the name. This is the last index in the absolute path for this slot. However, the materialized path can be truncated to remove some indices at the end. Since we need that information to resolve the field name, this adds the struct field idx to the TSlotDescriptor to pass it to the backend. This also adds a counter to the profile to track when correctness verification is on. This is useful for testing. Testing: - Added a custom cluster test using nested types with correctness verification - Examined some of the text files Change-Id: Ib9479754c2766a9dd6483ba065e26a4d3a22e7e9 Reviewed-on: http://gerrit.cloudera.org:8080/23075 Reviewed-by: Michael Smith <michael.smith@cloudera.com> Reviewed-by: Daniel Becker <daniel.becker@cloudera.com> Tested-by: Joe McDonnell <joemcdonnell@cloudera.com>
Welcome to Impala
Lightning-fast, distributed SQL queries for petabytes of data stored in open data and table formats.
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 Apache Iceberg, HDFS, Apache HBase, Apache Kudu, Amazon S3, Azure Data Lake Storage, Apache Hadoop Ozone and more!
- Wide analytic SQL support, including window functions and subqueries.
- On-the-fly code generation using LLVM to generate lightning-fast code tailored specifically to each individual query.
- Support for the most commonly-used Hadoop file formats, including Apache Parquet and Apache ORC.
- Support for industry-standard security protocols, including Kerberos, LDAP and TLS.
- Apache-licensed, 100% open source.
More about Impala
The fastest way to try out Impala is a quickstart Docker container. You can try out running queries and processing data sets in Impala on a single machine without installing dependencies. It can automatically load test data sets into Apache Kudu and Apache Parquet formats and you can start playing around with Apache Impala SQL within minutes.
To learn more about Impala as a user or administrator, or to try Impala, please visit the Impala homepage. Detailed documentation for administrators and users is available at Apache Impala documentation.
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. Impala supports x86_64 and has experimental support for arm64 (as of Impala 4.0). Impala Requirements contains more detailed information on the minimum CPU requirements.
Supported OS Distributions
Impala runs on Linux systems only. The supported distros are
- Ubuntu 16.04/18.04
- CentOS/RHEL 7/8
Other systems, e.g. SLES12, may also be supported but are not tested by the community.
Export Control Notice
This distribution uses cryptographic software and may be subject to export controls. Please refer to EXPORT_CONTROL.md for more information.
Build Instructions
See Impala's developer documentation to get started.
Detailed build notes has some detailed information on the project layout and build.