[jira] [Created] (SPARK-25579) Use quoted attribute names if needed in pushed ORC predicates

["Dongjoon Hyun (JIRA)" <ji...@apache.org>]

Dongjoon Hyun created SPARK-25579:
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             Summary: Use quoted attribute names if needed in pushed ORC predicates
                 Key: SPARK-25579
                 URL: https://issues.apache.org/jira/browse/SPARK-25579
             Project: Spark
          Issue Type: Bug
          Components: SQL
    Affects Versions: 2.4.0
            Reporter: Dongjoon Hyun


This issue aims to fix an ORC performance regression at Spark 2.4.0 RCs from Spark 2.3.2. For column names with `.`, the pushed predicates are ignored.

*Spark 2.3.2*
{code:java}
scala> val df = spark.range(Int.MaxValue).sample(0.2).toDF("col.with.dot")
scala> df.write.mode("overwrite").orc("/tmp/orc")
scala> df.write.mode("overwrite").parquet("/tmp/parquet")
scala> spark.sql("set spark.sql.orc.impl=native")
scala> spark.sql("set spark.sql.orc.filterPushdown=true")
scala> spark.time(spark.read.orc("/tmp/orc").where("`col.with.dot` = 50000").count)
Time taken: 803 ms

scala> spark.time(spark.read.parquet("/tmp/parquet").where("`col.with.dot` = 50000").count)
Time taken: 5573 ms
{code}
*Spark 2.4.0 RC2*
{code:java}
scala> spark.time(spark.read.orc("/tmp/orc").where("`col.with.dot` = 50000").count)
Time taken: 2405 ms{code}



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