160c144baa
### What changes were proposed in this pull request? This patch proposes to throw clear analysis exception if untyped `Dataset.select` takes typed column expression that needs input type. ### Why are the changes needed? `Dataset` provides few typed `select` helper functions to select typed column expressions. The maximum number of typed columns supported is 5. If wanting to select more than 5 typed columns, it silently calls untyped `Dataset.select` and can causes weird unresolved error, like: ``` org.apache.spark.sql.AnalysisException: unresolved operator 'Aggregate [fooagg(FooAgg(1), None, None, None, input[0, int, false] AS value#114, assertnotnull(cast(value#114 as int)), input[0, int, false] AS value#113, IntegerType, IntegerType, false) AS foo_agg_1#116, fooagg(FooAgg(2), None, None, None, input[0, int, false] AS value#119, assertnotnull(cast(value#119 as int)), input[0, int, false] AS value#118, IntegerType, IntegerType, false) AS foo_agg_2#121, fooagg(FooAgg(3), None, None, None, input[0, int, false] AS value#124, assertnotnull(cast(value#124 as int)), input[0, int, false] AS value#123, IntegerType, IntegerType, false) AS foo_agg_3#126, fooagg(FooAgg(4), None, None, None, input[0, int, false] AS value#129, assertnotnull(cast(value#129 as int)), input[0, int, false] AS value#128, IntegerType, IntegerType, false) AS foo_agg_4#131, fooagg(FooAgg(5), None, None, None, input[0, int, false] AS value#134, assertnotnull(cast(value#134 as int)), input[0, int, false] AS value#133, IntegerType, IntegerType, false) AS foo_agg_5#136, fooagg(FooAgg(6), None, None, None, input[0, int, false] AS value#139, assertnotnull(cast(value#139 as int)), input[0, int, false] AS value#138, IntegerType, IntegerType, false) AS foo_agg_6#141];; 'Aggregate [fooagg(FooAgg(1), None, None, None, input[0, int, false] AS value#114, assertnotnull(cast(value#114 as int)), input[0, int, false] AS value#113, IntegerType, IntegerType, false) AS foo_agg_1#116, fooagg(FooAgg(2), None, None, None, input[0, int, false] AS value#119, assertnotnull(cast(value#119 as int)), input[0, int, false] AS value#118, IntegerType, IntegerType, false) AS foo_agg_2#121, fooagg(FooAgg(3), None, None, None, input[0, int, false] AS value#124, assertnotnull(cast(value#124 as int)), input[0, int, false] AS value#123, IntegerType, IntegerType, false) AS foo_agg_3#126, fooagg(FooAgg(4), None, None, None, input[0, int, false] AS value#129, assertnotnull(cast(value#129 as int)), input[0, int, false] AS value#128, IntegerType, IntegerType, false) AS foo_agg_4#131, fooagg(FooAgg(5), None, None, None, input[0, int, false] AS value#134, assertnotnull(cast(value#134 as int)), input[0, int, false] AS value#133, IntegerType, IntegerType, false) AS foo_agg_5#136, fooagg(FooAgg(6), None, None, None, input[0, int, false] AS value#139, assertnotnull(cast(value#139 as int)), input[0, int, false] AS value#138, IntegerType, IntegerType, false) AS foo_agg_6#141] +- Project [_1#6 AS a#13, _2#7 AS b#14, _3#8 AS c#15, _4#9 AS d#16, _5#10 AS e#17, _6#11 AS F#18] +- LocalRelation [_1#6, _2#7, _3#8, _4#9, _5#10, _6#11] at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$class.failAnalysis(CheckAnalysis.scala:43) at org.apache.spark.sql.catalyst.analysis.Analyzer.failAnalysis(Analyzer.scala:95) at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$3.apply(CheckAnalysis.scala:431) at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$$anonfun$checkAnalysis$3.apply(CheckAnalysis.scala:430) at org.apache.spark.sql.catalyst.trees.TreeNode.foreachUp(TreeNode.scala:127) at org.apache.spark.sql.catalyst.analysis.CheckAnalysis$class.checkAnalysis(CheckAnalysis.scala:430) ``` However, to fully disallow typed columns as input to untyped `select` API will break current usage like `count` that is a `TypedColumn` in `functions`. In order to keep compatibility, we should allow current usage of certain `TypedColumn`s as input to untyped `select` API. For the `TypedColumn`s that will cause unresolved exception, we should explicitly let users know that they are incorrectly calling untyped `select` with typed columns which need input type. ### Does this PR introduce any user-facing change? Yes, but this PR only refines the error message. When users call `Dataset.select` API with typed column that needs input type, an analysis exception will be thrown. Previously an unresolved error will be thrown. ### How was this patch tested? Unit tests. Closes #27499 from viirya/SPARK-30590. Lead-authored-by: Liang-Chi Hsieh <viirya@gmail.com> Co-authored-by: Liang-Chi Hsieh <liangchi@uber.com> Signed-off-by: Wenchen Fan <wenchen@databricks.com> |
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Apache Spark
Spark is a unified analytics engine for large-scale data processing. It provides high-level APIs in Scala, Java, Python, and R, and an optimized engine that supports general computation graphs for data analysis. It also supports a rich set of higher-level tools including Spark SQL for SQL and DataFrames, MLlib for machine learning, GraphX for graph processing, and Structured Streaming for stream processing.
Online Documentation
You can find the latest Spark documentation, including a programming guide, on the project web page. This README file only contains basic setup instructions.
Building Spark
Spark is built using Apache Maven. To build Spark and its example programs, run:
./build/mvn -DskipTests clean package
(You do not need to do this if you downloaded a pre-built package.)
More detailed documentation is available from the project site, at "Building Spark".
For general development tips, including info on developing Spark using an IDE, see "Useful Developer Tools".
Interactive Scala Shell
The easiest way to start using Spark is through the Scala shell:
./bin/spark-shell
Try the following command, which should return 1,000,000,000:
scala> spark.range(1000 * 1000 * 1000).count()
Interactive Python Shell
Alternatively, if you prefer Python, you can use the Python shell:
./bin/pyspark
And run the following command, which should also return 1,000,000,000:
>>> spark.range(1000 * 1000 * 1000).count()
Example Programs
Spark also comes with several sample programs in the examples directory.
To run one of them, use ./bin/run-example <class> [params]. For example:
./bin/run-example SparkPi
will run the Pi example locally.
You can set the MASTER environment variable when running examples to submit
examples to a cluster. This can be a mesos:// or spark:// URL,
"yarn" to run on YARN, and "local" to run
locally with one thread, or "local[N]" to run locally with N threads. You
can also use an abbreviated class name if the class is in the examples
package. For instance:
MASTER=spark://host:7077 ./bin/run-example SparkPi
Many of the example programs print usage help if no params are given.
Running Tests
Testing first requires building Spark. Once Spark is built, tests can be run using:
./dev/run-tests
Please see the guidance on how to run tests for a module, or individual tests.
There is also a Kubernetes integration test, see resource-managers/kubernetes/integration-tests/README.md
A Note About Hadoop Versions
Spark uses the Hadoop core library to talk to HDFS and other Hadoop-supported storage systems. Because the protocols have changed in different versions of Hadoop, you must build Spark against the same version that your cluster runs.
Please refer to the build documentation at "Specifying the Hadoop Version and Enabling YARN" for detailed guidance on building for a particular distribution of Hadoop, including building for particular Hive and Hive Thriftserver distributions.
Configuration
Please refer to the Configuration Guide in the online documentation for an overview on how to configure Spark.
Contributing
Please review the Contribution to Spark guide for information on how to get started contributing to the project.