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https://issues.apache.org/jira/browse/DRILL-4373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15585692#comment-15585692
]
ASF GitHub Bot commented on DRILL-4373:
---------------------------------------
Github user vdiravka commented on a diff in the pull request:
https://github.com/apache/drill/pull/600#discussion_r83853471
--- Diff:
exec/java-exec/src/main/java/org/apache/drill/exec/store/parquet/ParquetReaderUtility.java
---
@@ -45,4 +53,34 @@ public static int getIntFromLEBytes(byte[] input, int
start) {
}
return out;
}
+
+ /**
+ * Utilities for converting from parquet INT96 binary (impala, hive
timestamp)
+ * to date time value. This utilizes the Joda library.
+ */
+ public static class NanoTimeUtils {
+
+ public static final long NANOS_PER_DAY = TimeUnit.DAYS.toNanos(1);
+ public static final long NANOS_PER_HOUR = TimeUnit.HOURS.toNanos(1);
+ public static final long NANOS_PER_MINUTE =
TimeUnit.MINUTES.toNanos(1);
+ public static final long NANOS_PER_SECOND =
TimeUnit.SECONDS.toNanos(1);
+ public static final long NANOS_PER_MILLISECOND =
TimeUnit.MILLISECONDS.toNanos(1);
+
+ /**
+ * @param binaryTimeStampValue
+ * hive, impala timestamp values with nanoseconds precision
+ * are stored in parquet Binary as INT96
+ *
+ * @return the number of milliseconds since January 1, 1970, 00:00:00
GMT
+ * represented by @param binaryTimeStampValue .
+ */
+ public static long getDateTimeValueFromBinary(Binary
binaryTimeStampValue) {
+ NanoTime nt = NanoTime.fromBinary(binaryTimeStampValue);
+ int julianDay = nt.getJulianDay();
+ long nanosOfDay = nt.getTimeOfDayNanos();
+ return DateTimeUtils.fromJulianDay(julianDay-0.5d) +
nanosOfDay/NANOS_PER_MILLISECOND;
--- End diff --
The comment is removed. And numbers are replaced with constants from
ParquetReaderUtility and DateTimeConstants.
> Drill and Hive have incompatible timestamp representations in parquet
> ---------------------------------------------------------------------
>
> Key: DRILL-4373
> URL: https://issues.apache.org/jira/browse/DRILL-4373
> Project: Apache Drill
> Issue Type: Improvement
> Components: Storage - Hive, Storage - Parquet
> Affects Versions: 1.8.0
> Reporter: Rahul Challapalli
> Assignee: Karthikeyan Manivannan
> Labels: doc-impacting
> Fix For: 1.9.0
>
>
> git.commit.id.abbrev=83d460c
> I created a parquet file with a timestamp type using Drill. Now if I define a
> hive table on top of the parquet file and use "timestamp" as the column type,
> drill fails to read the hive table through the hive storage plugin
> Implementation:
> Added int96 to timestamp converter for both parquet readers and controling it
> by system / session option "store.parquet.int96_as_timestamp".
> The value of the option is false by default for the proper work of the old
> query scripts with the "convert_from TIMESTAMP_IMPALA" function.
> When the option is true using of that function is unnesessary and can lead to
> the query fail.
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