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From GitBox <...@apache.org>
Subject [GitHub] [drill] paul-rogers commented on a change in pull request #1953: Add docs for Drill Metastore
Date Tue, 04 Feb 2020 03:15:07 GMT
paul-rogers commented on a change in pull request #1953: Add docs for Drill Metastore
URL: https://github.com/apache/drill/pull/1953#discussion_r366679238
 
 

 ##########
 File path: _docs/sql-reference/sql-commands/007-analyze-table-refresh-metadata.md
 ##########
 @@ -0,0 +1,158 @@
+---
+title: "ANALYZE TABLE REFRESH METADATA"
+parent: "SQL Commands"
+date: 2020-01-13
+---
+
+Starting from Drill 1.17, you can store table metadata (including schema and computed statistics)
into Drill Metastore.
+This metadata will be used when querying a table for more optimal plan creation.
+
+{% include startnote.html %}In Drill 1.17, this feature is supported for Parquet tables only
and is disabled by default.{% include endnote.html %}
+
+To enable Drill Metastore usage, the following option `metastore.enabled` should be set to
`true`, as shown:
+
+	SET `metastore.enabled` = true;
+
+Alternatively, you can enable the option in the Drill Web UI at `http://<drill-hostname-or-ip-address>:8047/options`.
+
+## Syntax
+
+The ANALYZE TABLE REFRESH METADATA statement supports the following syntax:
+
+	ANALYZE TABLE [table_name] [COLUMNS {(col1, col2, ...) | NONE}]
+	REFRESH METADATA ['level' LEVEL]
+	[{COMPUTE | ESTIMATE} | STATISTICS [(column1, column2, ...)]
+	[ SAMPLE number PERCENT ]]
+
+## Parameters
+
+*table_name*
+The name of the table or directory for which Drill will collect table metadata. If the table
does not exist, or the table
 
 Review comment:
   (Here it is not clear if the command gathers schema and statistics? Or, only schema by
default?)

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