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Posted to issues@drill.apache.org by "Arina Ielchiieva (Jira)" <ji...@apache.org> on 2019/10/22 14:46:00 UTC
[jira] [Updated] (DRILL-7418) MetadataDirectGroupScan improvements
[ https://issues.apache.org/jira/browse/DRILL-7418?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Arina Ielchiieva updated DRILL-7418:
------------------------------------
Description:
When count is converted to direct scan (case when statistics or table metadata are available and there is no need to perform count operation), {{MetadataDirectGroupScan}} is used. Proposed {{MetadataDirectGroupScan}} enhancements:
1. show table root instead listing all table files. If users= has lots of files, query plan gets polluted with files enumeration. Since files are not used for calculation (only metadata), they are not relevant and can be excluded from plan.
Before:
{noformat}
| 00-00 Screen
00-01 Project(EXPR$0=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
00-02 DirectScan(groupscan=[files = [/drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_0.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_5.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_4.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_9.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_3.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_6.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_7.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_10.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_2.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_1.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_8.parquet], numFiles = 11, usedMetadataSummaryFile = false, DynamicPojoRecordReader{records = [[1560060, 2880404, 2880404, 0]]}])
{noformat}
After:
{noformat}
| 00-00 Screen
00-01 Project(EXPR$0=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
00-02 DirectScan(groupscan=[selectionRoot = /drill/testdata/metadata_cache/store_sales_null_blocks_all, numFiles = 11,
usedMetadataSummaryFile = false, DynamicPojoRecordReader{records = [[1560060, 2880404, 2880404, 0]]}])
{noformat}
2. Submission of physical plan which contains {{MetadataDirectGroupScan}} fails with deserialization errors, proper ser / de should be implemented.
was:
When count is converted to direct scan (case when statistics and table metadata are available and there is no need to perform count operation), {{MetadataDirectGroupScan}} is used. Proposed {{MetadataDirectGroupScan}} enhancements:
1. show table root instead listing all table files. If users= has lots of files, query plan gets polluted with files enumeration. Since files are not used for calculation (only metadata), they are not relevant and can be excluded from plan.
Before:
{noformat}
| 00-00 Screen
00-01 Project(EXPR$0=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
00-02 DirectScan(groupscan=[files = [/drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_0.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_5.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_4.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_9.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_3.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_6.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_7.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_10.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_2.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_1.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_8.parquet], numFiles = 11, usedMetadataSummaryFile = false, DynamicPojoRecordReader{records = [[1560060, 2880404, 2880404, 0]]}])
{noformat}
After:
{noformat}
| 00-00 Screen
00-01 Project(EXPR$0=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
00-02 DirectScan(groupscan=[selectionRoot = /drill/testdata/metadata_cache/store_sales_null_blocks_all, numFiles = 11,
usedMetadataSummaryFile = false, DynamicPojoRecordReader{records = [[1560060, 2880404, 2880404, 0]]}])
{noformat}
2. Submission of physical plan which contains {{MetadataDirectGroupScan}} fails with deserialization errors, proper ser / de should be implemented.
> MetadataDirectGroupScan improvements
> ------------------------------------
>
> Key: DRILL-7418
> URL: https://issues.apache.org/jira/browse/DRILL-7418
> Project: Apache Drill
> Issue Type: Improvement
> Affects Versions: 1.16.0
> Reporter: Arina Ielchiieva
> Assignee: Arina Ielchiieva
> Priority: Minor
> Fix For: 1.17.0
>
>
> When count is converted to direct scan (case when statistics or table metadata are available and there is no need to perform count operation), {{MetadataDirectGroupScan}} is used. Proposed {{MetadataDirectGroupScan}} enhancements:
> 1. show table root instead listing all table files. If users= has lots of files, query plan gets polluted with files enumeration. Since files are not used for calculation (only metadata), they are not relevant and can be excluded from plan.
> Before:
> {noformat}
> | 00-00 Screen
> 00-01 Project(EXPR$0=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
> 00-02 DirectScan(groupscan=[files = [/drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_0.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_5.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_4.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_9.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_3.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_6.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_7.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_10.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_2.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_1.parquet, /drill/testdata/metadata_cache/store_sales_null_blocks_all/0_0_8.parquet], numFiles = 11, usedMetadataSummaryFile = false, DynamicPojoRecordReader{records = [[1560060, 2880404, 2880404, 0]]}])
> {noformat}
> After:
> {noformat}
> | 00-00 Screen
> 00-01 Project(EXPR$0=[$0], EXPR$1=[$1], EXPR$2=[$2], EXPR$3=[$3])
> 00-02 DirectScan(groupscan=[selectionRoot = /drill/testdata/metadata_cache/store_sales_null_blocks_all, numFiles = 11,
> usedMetadataSummaryFile = false, DynamicPojoRecordReader{records = [[1560060, 2880404, 2880404, 0]]}])
> {noformat}
> 2. Submission of physical plan which contains {{MetadataDirectGroupScan}} fails with deserialization errors, proper ser / de should be implemented.
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