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ASF GitHub Bot commented on DRILL-6204: --------------------------------------- Github user asfgit closed the pull request at: https://github.com/apache/drill/pull/1146 > Pass tables columns without partition columns to empty Hive reader > ------------------------------------------------------------------ > > Key: DRILL-6204 > URL: https://issues.apache.org/jira/browse/DRILL-6204 > Project: Apache Drill > Issue Type: Bug > Components: Storage - Hive > Affects Versions: 1.12.0 > Reporter: Arina Ielchiieva > Assignee: Arina Ielchiieva > Priority: Major > Labels: ready-to-commit > Fix For: 1.13.0 > > > When {{store.hive.optimize_scan_with_native_readers}} is enabled, > {{HiveDrillNativeScanBatchCreator}} is used to read data from Hive tables > directly from file system. In case when table is empty or no row group are > matched, empty {{HiveDefaultReader}} is called to output the schema. > If such situation happens, currently Drill fails with the following error: > {noformat} > org.apache.drill.common.exceptions.UserRemoteException: SYSTEM ERROR: > NullPointerException Setup failed for null > {noformat} > This happens because instead of passing only table columns to the empty > reader (as we do when creating non-empty reader), we passed all columns which > may contain partition columns as well. Readers fails to find partition column > in table schema. As mentioned in on lines 81 - 82 in > {{HiveDrillNativeScanBatchCreator}}, we deliberately separate out partition > columns and table columns to pass partition columns separately: > {noformat} > // Separate out the partition and non-partition columns. Non-partition > columns are passed directly to the > // ParquetRecordReader. Partition columns are passed to ScanBatch. > {noformat} > To fix the problem we need to pass table columns instead of all columns. > {code:java} > if (readers.size() == 0) { > readers.add(new HiveDefaultReader(table, null, null, newColumns, > context, conf, > ImpersonationUtil.createProxyUgi(config.getUserName(), > context.getQueryUserName()))); > } > {code} -- This message was sent by Atlassian JIRA (v7.6.3#76005)