### What changes were proposed in this pull request? docs/sql-ref-syntax-qry-select-usedb.md -> docs/sql-ref-syntax-ddl-usedb.md docs/sql-ref-syntax-aux-refresh-table.md -> docs/sql-ref-syntax-aux-cache-refresh-table.md ### Why are the changes needed? usedb belongs to DDL. Its location should be consistent with other DDL commands file locations similar reason for refresh table ### Does this PR introduce _any_ user-facing change? before change, when clicking USE DATABASE, the side bar menu shows select commands <img width="1200" alt="Screen Shot 2020-07-04 at 9 05 35 AM" src="https://user-images.githubusercontent.com/13592258/86516696-b45f8a80-bdd7-11ea-8dba-3a5cca22aad3.png"> after change, when clicking USE DATABASE, the side bar menu shows DDL commands <img width="1120" alt="Screen Shot 2020-07-04 at 9 06 06 AM" src="https://user-images.githubusercontent.com/13592258/86516703-bf1a1f80-bdd7-11ea-8a90-ae7eaaafd44c.png"> before change, when clicking refresh table, the side bar menu shows Auxiliary statements <img width="1200" alt="Screen Shot 2020-07-04 at 9 30 40 AM" src="https://user-images.githubusercontent.com/13592258/86516877-3d2af600-bdd9-11ea-9568-0a6f156f57da.png"> after change, when clicking refresh table, the side bar menu shows Cache statements <img width="1199" alt="Screen Shot 2020-07-04 at 9 35 21 AM" src="https://user-images.githubusercontent.com/13592258/86516937-b4f92080-bdd9-11ea-8ad1-5f5a7f58d76b.png"> ### How was this patch tested? Manually build and check Closes #28995 from huaxingao/docs_fix. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: Huaxin Gao <huaxing@us.ibm.com>
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layout | title | displayTitle | license |
---|---|---|---|
global | CACHE TABLE | CACHE TABLE | 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. |
Description
CACHE TABLE
statement caches contents of a table or output of a query with the given storage level. If a query is cached, then a temp view will be created for this query.
This reduces scanning of the original files in future queries.
Syntax
CACHE [ LAZY ] TABLE table_identifier
[ OPTIONS ( 'storageLevel' [ = ] value ) ] [ [ AS ] query ]
Parameters
-
LAZY
Only cache the table when it is first used, instead of immediately.
-
table_identifier
Specifies the table or view name to be cached. The table or view name may be optionally qualified with a database name.
Syntax:
[ database_name. ] table_name
-
OPTIONS ( 'storageLevel' [ = ] value )
OPTIONS
clause withstorageLevel
key and value pair. A Warning is issued when a key other thanstorageLevel
is used. The valid options forstorageLevel
are:NONE
DISK_ONLY
DISK_ONLY_2
MEMORY_ONLY
MEMORY_ONLY_2
MEMORY_ONLY_SER
MEMORY_ONLY_SER_2
MEMORY_AND_DISK
MEMORY_AND_DISK_2
MEMORY_AND_DISK_SER
MEMORY_AND_DISK_SER_2
OFF_HEAP
An Exception is thrown when an invalid value is set for
storageLevel
. IfstorageLevel
is not explicitly set usingOPTIONS
clause, the defaultstorageLevel
is set toMEMORY_AND_DISK
. -
query
A query that produces the rows to be cached. It can be in one of following formats:
- a
SELECT
statement - a
TABLE
statement - a
FROM
statement
- a
Examples
CACHE TABLE testCache OPTIONS ('storageLevel' 'DISK_ONLY') SELECT * FROM testData;