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https://issues.apache.org/jira/browse/DRILL-7706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17086578#comment-17086578
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ASF GitHub Bot commented on DRILL-7706:
---------------------------------------
vvysotskyi commented on pull request #2060: DRILL-7706: Implement Drill RDBMS
Metastore for Tables component
URL: https://github.com/apache/drill/pull/2060#discussion_r410730382
##########
File path:
metastore/rdbms-metastore/src/main/resources/db/changelog/changes/initial_ddls.yaml
##########
@@ -0,0 +1,397 @@
+#
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements. See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership. The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License. You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Creates 5 RDBMS Metastore tables component tables: TABLES, SEGMENTS, FILES,
ROW_GROUPS, PARTITIONS.
+databaseChangeLog:
+ # to preserve upper case naming in some DBs (ex: PostgreSQL) and quote
reserved column names (ex: COLUMN)
+ - objectQuotingStrategy: QUOTE_ALL_OBJECTS
+ - changeSet:
+ id: 1
+ author: arina
+ changes:
+ - createTable:
+ tableName: TABLES
+ columns:
+ - column:
+ name: STORAGE_PLUGIN
+ type: VARCHAR(100)
+ constraints:
+ primaryKey: true
+ nullable: false
+ - column:
+ name: WORKSPACE
+ type: VARCHAR(100)
+ constraints:
+ primaryKey: true
+ nullable: false
+ - column:
+ name: TABLE_NAME
+ type: VARCHAR(200)
+ constraints:
+ primaryKey: true
+ nullable: false
+ - column:
+ name: OWNER
+ type: VARCHAR(100)
+ - column:
+ name: TABLE_TYPE
+ type: VARCHAR(100)
+ - column:
+ name: METADATA_KEY
+ type: VARCHAR(100)
+ constraints:
+ nullable: false
+ - column:
+ name: METADATA_TYPE
+ type: VARCHAR(100)
+ constraints:
+ nullable: false
+ - column:
+ name: LOCATION
+ type: VARCHAR(500)
Review comment:
Realy a good choice for this value. Though some linux-based systems limit
its size to 256 bytes, other systems like Windows removed the existing 260
characters limit. So I think 500 value is fine.
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> Drill RDBMS Metastore
> ---------------------
>
> Key: DRILL-7706
> URL: https://issues.apache.org/jira/browse/DRILL-7706
> Project: Apache Drill
> Issue Type: New Feature
> Affects Versions: 1.17.0
> Reporter: Arina Ielchiieva
> Assignee: Arina Ielchiieva
> Priority: Major
> Fix For: 1.18.0
>
>
> Currently Drill has only one Metastore implementation based on Iceberg
> tables. Iceberg tables are file based storage that supports concurrent writes
> / reads but required to be placed on distributed file system.
> This Jira aims to implement Drill RDBMS Metastore which will store Drill
> Metastore metadata in the database of the user's choice. Currently,
> PostgreSQL and MySQL databases are supported, others might work as well but
> no testing was done. Also out of box for demonstration / testing purposes
> Drill will setup SQLite file based embedded database but this is only
> applicable for Drill in embedded mode.
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