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https://issues.apache.org/jira/browse/SPARK-26509?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16761927#comment-16761927
]
Nandor Kollar commented on SPARK-26509:
---------------------------------------
[~yumwang] here's an example to reproduce this failure in a test:
{code}
class Test_SPARK_26509 extends ParquetCompatibilityTest with SharedSQLContext {
test("failing test for Parquet V2 DELTA_BYTE_ARRAY") {
val extraOptions = Map[String, String](
// Write a Parquet file with writer version2.
ParquetOutputFormat.WRITER_VERSION ->
ParquetProperties.WriterVersion.PARQUET_2_0.toString
)
val hadoopConf = spark.sessionState.newHadoopConfWithOptions(extraOptions)
withSQLConf(SQLConf.PARQUET_VECTORIZED_READER_ENABLED.key -> "true") {
withTempPath { dir =>
val path = s"${dir.getCanonicalPath}/test.parquet"
spark.range(1).selectExpr("('hello') AS i")
.coalesce(1).write.options(extraOptions).mode("overwrite").parquet(path)
spark.read.parquet(path).collect
}
}
}
}
{code}
> Parquet DELTA_BYTE_ARRAY is not supported in Spark 2.x's Vectorized Reader
> --------------------------------------------------------------------------
>
> Key: SPARK-26509
> URL: https://issues.apache.org/jira/browse/SPARK-26509
> Project: Spark
> Issue Type: Bug
> Components: Spark Core, SQL
> Affects Versions: 2.4.0
> Reporter: Filipe Gonzaga Miranda
> Priority: Major
> Original Estimate: 40h
> Remaining Estimate: 40h
>
> I get the exception below Spark 2.4 reading parquet files where some columns
> are DELTA_BYTE_ARRAY encoded.
>
> {code:java}
> java.lang.UnsupportedOperationException: Unsupported encoding:
> DELTA_BYTE_ARRAY
>
> {code}
>
> If the property:
> spark.sql.parquet.enableVectorizedReader is set to false that works
> The parquet files were written with Parquet V2, and as far as I understand
> the V2 is the version used in Spark 2.x.
> I did not find any property to change which Parquet Version Spark uses (V1,
> V2).
> Is there anyway to benefit from the Vectorized Reader? Or this is something
> like a new implementation to support this version? I would propose so.
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