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[GitHub] [spark] MaxGekk opened a new pull request #28842: [WIP][SQL] Create date/timestamp formatters once before collect in `hiveResultString()`

MaxGekk opened a new pull request #28842:
URL: https://github.com/apache/spark/pull/28842


   ### What changes were proposed in this pull request?
   Move creation of `dateFormatter` and `timestampFormatter` from the constructor of the `HiveResult` object to `HiveResult. hiveResultString()`. This allows to resolve time zone ID from Spark's session time zone `spark.sql.session.timeZone` and create date/timestamp formatters only once before collecting `java.sql.Timestamp`/`java.sql.Date` values.
   
   ### Why are the changes needed?
   To fix perf regression comparing to Spark 2.4
   
   ### Does this PR introduce _any_ user-facing change?
   No
   
   ### How was this patch tested?
   - By existing test suite `HiveResultSuite` and etc.
   


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Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/spark/pull/28842#issuecomment-644789874


   **[Test build #124126 has started](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/124126/testReport)** for PR 28842 at commit [`650a858`](https://github.com/apache/spark/commit/650a8582b932edb0e9389061f70de0d03a2aa482).


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URL: https://github.com/apache/spark/pull/28842#issuecomment-644699370


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[GitHub] [spark] SparkQA commented on pull request #28842: [WIP][SQL] Create date/timestamp formatters once before collect in `hiveResultString()`

Posted by GitBox <gi...@apache.org>.
SparkQA commented on pull request #28842:
URL: https://github.com/apache/spark/pull/28842#issuecomment-644865913


   **[Test build #124123 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/124123/testReport)** for PR 28842 at commit [`a152d94`](https://github.com/apache/spark/commit/a152d94485b9d53521175b5b6574c8233d25e744).
    * This patch passes all tests.
    * This patch merges cleanly.
    * This patch adds the following public classes _(experimental)_:
     * `  case class TimeFormatters(date: DateFormatter, timestamp: TimestampFormatter)`


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[GitHub] [spark] cloud-fan commented on a change in pull request #28842: [SPARK-32006][SQL] Create date/timestamp formatters once before collect in `hiveResultString()`

Posted by GitBox <gi...@apache.org>.
cloud-fan commented on a change in pull request #28842:
URL: https://github.com/apache/spark/pull/28842#discussion_r441297086



##########
File path: sql/core/src/main/scala/org/apache/spark/sql/execution/HiveResult.scala
##########
@@ -72,47 +90,32 @@ object HiveResult {
     }
   }
 
-  // We can create the date formatter only once because it does not depend on Spark's
-  // session time zone controlled by the SQL config `spark.sql.session.timeZone`.
-  // The `zoneId` parameter is used only in parsing of special date values like `now`,
-  // `yesterday` and etc. but not in date formatting. While formatting of:
-  // - `java.time.LocalDate`, zone id is not used by `DateTimeFormatter` at all.
-  // - `java.sql.Date`, the date formatter delegates formatting to the legacy formatter
-  //   which uses the default system time zone `TimeZone.getDefault`. This works correctly
-  //   due to `DateTimeUtils.toJavaDate` which is based on the system time zone too.
-  private val dateFormatter = DateFormatter(
-    format = DateFormatter.defaultPattern,
-    // We can set any time zone id. UTC was taken for simplicity.
-    zoneId = ZoneOffset.UTC,
-    locale = DateFormatter.defaultLocale,
-    // Use `FastDateFormat` as the legacy formatter because it is thread-safe.
-    legacyFormat = LegacyDateFormats.FAST_DATE_FORMAT,
-    isParsing = false)
-  private def timestampFormatter = TimestampFormatter.getFractionFormatter(
-    DateTimeUtils.getZoneId(SQLConf.get.sessionLocalTimeZone))
-
   /** Formats a datum (based on the given data type) and returns the string representation. */
-  def toHiveString(a: (Any, DataType), nested: Boolean = false): String = a match {
+  def toHiveString(
+    a: (Any, DataType),

Review comment:
       nit: 4 space indentation




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[GitHub] [spark] cloud-fan commented on pull request #28842: [SPARK-32006][SQL] Create date/timestamp formatters once before collect in `hiveResultString()`

Posted by GitBox <gi...@apache.org>.
cloud-fan commented on pull request #28842:
URL: https://github.com/apache/spark/pull/28842#issuecomment-645178845


   The last commit updates indentation only, I'm merging it to master, thanks!


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[GitHub] [spark] MaxGekk commented on pull request #28842: [SPARK-32006][SQL] Create date/timestamp formatters once before collect in `hiveResultString()`

Posted by GitBox <gi...@apache.org>.
MaxGekk commented on pull request #28842:
URL: https://github.com/apache/spark/pull/28842#issuecomment-644953420


   @cloud-fan @juliuszsompolski @HyukjinKwon @bogdanghit @gatorsmile Please, take a look at this PR.


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   **[Test build #124126 has finished](https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder/124126/testReport)** for PR 28842 at commit [`650a858`](https://github.com/apache/spark/commit/650a8582b932edb0e9389061f70de0d03a2aa482).
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    * This patch adds no public classes.


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    * This patch **fails due to an unknown error code, -9**.
    * This patch merges cleanly.
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[GitHub] [spark] cloud-fan closed pull request #28842: [SPARK-32006][SQL] Create date/timestamp formatters once before collect in `hiveResultString()`

Posted by GitBox <gi...@apache.org>.
cloud-fan closed pull request #28842:
URL: https://github.com/apache/spark/pull/28842


   


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