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SPARKC-504: Save null UDTs #1228

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SPARKC-504: Save null UDTs #1228

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da9a475
Allow null UDTs
acustiq Feb 6, 2020
7d00627
Fix the hyperlink to save modes in the latest Spark documentation
msmygit Mar 16, 2020
4292b2a
Merge pull request #1232 from msmygit/master
RussellSpitzer Mar 17, 2020
719c760
Update README.md
RussellSpitzer Mar 24, 2020
1141c96
Update README.md
RussellSpitzer Mar 24, 2020
7cc3577
Merge branch 'b3.0'
RussellSpitzer Mar 25, 2020
0daa7f9
Update Docs to Reflect 3.0 Alpha Release
RussellSpitzer Mar 25, 2020
4e577ab
Bad Link for 3.0-alpha
RussellSpitzer Mar 25, 2020
8b73cb2
Merge branch 'b3.0'
RussellSpitzer Mar 27, 2020
c1645d9
Merge pull request #1238 from datastax/b3.0
RussellSpitzer Mar 27, 2020
73c7dd6
Merge branch 'master' of https://github.com/datastax/spark-cassandra-…
acustiq Mar 28, 2020
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5 changes: 4 additions & 1 deletion CHANGES.txt
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@@ -1,4 +1,4 @@
3.0.0-Alpha
3.0-Alpha
* Include all DS Specific Features
* Includes CassandraHiveMetastore
* Structured Streaming Sink Support
Expand All @@ -12,6 +12,9 @@

*******************************************************************************

2.4.3
* Fix issue with Hadoop3 Compatibility

2.4.2
* Support for Scala 2.12 (SPARKC-458)

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10 changes: 5 additions & 5 deletions README.md
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Expand Up @@ -4,10 +4,10 @@

| What | Where |
| ---------- | ----- |
| Packages | [Spark Cassandra Connector Spark Packages Website](https://spark-packages.org/package/datastax/spark-cassandra-connector) |
| Community | Chat with us at [DataStax Academy's #spark-connector Slack channel](#slack) |
| Scala Docs | Most Recent Release (2.4.2): [Spark-Cassandra-Connector](https://datastax.github.io/spark-cassandra-connector/ApiDocs/2.4.2/spark-cassandra-connector/), [Embedded-Cassandra](https://datastax.github.io/spark-cassandra-connector/ApiDocs/2.4.2/spark-cassandra-connector-embedded/) |

| Community | Chat with us at [Datastax and Cassandra Q&A](https://community.datastax.com/index.html) |
| Scala Docs | Most Recent Release (2.4.3): [Spark-Cassandra-Connector](https://datastax.github.io/spark-cassandra-connector/ApiDocs/2.4.2/spark-cassandra-connector/), [Embedded-Cassandra](https://datastax.github.io/spark-cassandra-connector/ApiDocs/2.4.2/spark-cassandra-connector-embedded/) |
| Latest Production Release | [2.4.3](https://mvnrepository.com/artifact/com.datastax.spark/spark-cassandra-connector_2.12/2.4.3) |
| Latest Preview Release | [3.0-alpha](https://mvnrepository.com/artifact/com.datastax.spark/spark-cassandra-connector_2.12/3.0-alpha) |
## Features

*Lightning-fast cluster computing with Apache Spark™ and Apache Cassandra®.*
Expand Down Expand Up @@ -105,7 +105,7 @@ This project has also been published to the Maven Central Repository.
For SBT to download the connector binaries, sources and javadoc, put this in your project
SBT config:

libraryDependencies += "com.datastax.spark" %% "spark-cassandra-connector" % "2.4.2"
libraryDependencies += "com.datastax.spark" %% "spark-cassandra-connector" % "2.4.3"

* The default Scala version for Spark 2.0+ is 2.11 please choose the appropriate build. See the
[FAQ](doc/FAQ.md) for more information
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8 changes: 4 additions & 4 deletions doc/0_quick_start.md
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Expand Up @@ -15,14 +15,14 @@ Configure a new Scala project with the Apache Spark and dependency.

The dependencies are easily retrieved via Maven Central

libraryDependencies += "com.datastax.spark" % "spark-cassandra-connector_2.11" % "2.4.2"
libraryDependencies += "com.datastax.spark" % "spark-cassandra-connector_2.11" % "2.4.3"

The spark-packages libraries can also be used with spark-submit and spark shell, these
commands will place the connector and all of its dependencies on the path of the
Spark Driver and all Spark Executors.

$SPARK_HOME/bin/spark-shell --packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.2
$SPARK_HOME/bin/spark-submit --packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.2
$SPARK_HOME/bin/spark-shell --packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.3
$SPARK_HOME/bin/spark-submit --packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.3

For the list of available versions, see:
- https://spark-packages.org/package/datastax/spark-cassandra-connector
Expand Down Expand Up @@ -58,7 +58,7 @@ Run the `spark-shell` with the packages line for your version. To configure
the default Spark Configuration pass key value pairs with `--conf`

$SPARK_HOME/bin/spark-shell --conf spark.cassandra.connection.host=127.0.0.1 \
--packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.2
--packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.3

This command would set the Spark Cassandra Connector parameter
`spark.cassandra.connection.host` to `127.0.0.1`. Change this
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2 changes: 1 addition & 1 deletion doc/13_spark_shell.md
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Expand Up @@ -18,7 +18,7 @@ Find additional versions at [Spark Packages](https://spark-packages.org/package/
```bash
cd spark/install/dir
#Include the --master if you want to run against a spark cluster and not local mode
./bin/spark-shell [--master sparkMasterAddress] --jars yourAssemblyJar --packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.2 --conf spark.cassandra.connection.host=yourCassandraClusterIp
./bin/spark-shell [--master sparkMasterAddress] --jars yourAssemblyJar --packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.3 --conf spark.cassandra.connection.host=yourCassandraClusterIp
```

By default spark will log everything to the console and this may be a bit of an overload. To change this copy and modify the `log4j.properties` template file
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4 changes: 2 additions & 2 deletions doc/15_python.md
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Expand Up @@ -16,7 +16,7 @@ https://spark-packages.org/package/datastax/spark-cassandra-connector

```bash
./bin/pyspark \
--packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.2
--packages com.datastax.spark:spark-cassandra-connector_2.11:2.4.3
```

### Loading a DataFrame in Python
Expand Down Expand Up @@ -46,7 +46,7 @@ source and by specifying keyword arguments for `keyspace` and `table`.

### Saving a DataFrame in Python to Cassandra

A DataFrame can be saved to an *existing* Cassandra table by using the the `org.apache.spark.sql.cassandra` source and by specifying keyword arguments for `keyspace` and `table` and saving mode (`append`, `overwrite`, `error` or `ignore`, see [Data Sources API doc](https://spark.apache.org/docs/latest/sql-programming-guide.html#save-modes)).
A DataFrame can be saved to an *existing* Cassandra table by using the the `org.apache.spark.sql.cassandra` source and by specifying keyword arguments for `keyspace` and `table` and saving mode (`append`, `overwrite`, `error` or `ignore`, see [Data Sources API doc](https://spark.apache.org/docs/latest/sql-data-sources-load-save-functions.html#save-modes)).

#### Example Saving to a Cassanra Table as a Pyspark DataFrame
```python
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2 changes: 1 addition & 1 deletion ...er/src/main/scala/com/datastax/spark/connector/mapper/MappedToGettableDataConverter.scala
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Expand Up @@ -208,7 +208,7 @@ object MappedToGettableDataConverter extends StrictLogging {
for (i <- columnValues.indices)
columnValues(i) = converters(i).convert(columnValues(i))
struct.newInstance(columnValues: _*)
case None =>
case _ =>
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Maybe i'm just paranoid, but should we do None | null? I may just be paranoid (this wouldn't be the first time...)

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@acustiq acustiq Mar 30, 2020 •
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I would think that the _ wildcard symbol catches both None and null as it matches anything:

case _ => // Wild card pattern -- matches anything

Source: https://docs.scala-lang.org/tutorials/FAQ/finding-symbols.html

null.asInstanceOf[struct.ValueRepr]
}
}
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7 changes: 7 additions & 0 deletions ...rc/test/scala/com/datastax/spark/connector/mapper/MappedToGettableDataConverterSpec.scala
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Expand Up @@ -143,6 +143,13 @@ class MappedToGettableDataConverterSpec extends FlatSpec with Matchers {
row.isNullAt(1) shouldEqual true
}

it should "convert null UDTs to null" in {
val userTable = newTable(loginColumn, passwordColumn)
val converter = MappedToGettableDataConverter[UserWithOption](userTable, userTable.columnRefs)
val row = converter.convert(null)
row shouldEqual null
}

case class UserWithNestedOption(login: String, address: Option[Address])

it should "convert None case class to null" in {
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