spark-instrumented-optimizer/docs/sql-ref-syntax-qry.md
Takeshi Yamamuro c2bea045e3 [SPARK-33264][SQL][DOCS] Add a dedicated page for SQL-on-file in SQL documents
### What changes were proposed in this pull request?

This PR intends to add a dedicated page for SQL-on-file in SQL documents.
This comes from the comment: https://github.com/apache/spark/pull/30095/files#r508965149

### Why are the changes needed?

For better documentations.

### Does this PR introduce _any_ user-facing change?

<img width="544" alt="Screen Shot 2020-10-28 at 9 56 59" src="https://user-images.githubusercontent.com/692303/97378051-c1fbcb80-1904-11eb-86c0-a88c5269d41c.png">

### How was this patch tested?

N/A

Closes #30165 from maropu/DocForFile.

Authored-by: Takeshi Yamamuro <yamamuro@apache.org>
Signed-off-by: Takeshi Yamamuro <yamamuro@apache.org>
2020-10-28 11:21:35 +09:00

2.6 KiB

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global Data Retrieval Data Retrieval 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.

Spark supports SELECT statement that is used to retrieve rows from one or more tables according to the specified clauses. The full syntax and brief description of supported clauses are explained in SELECT section. The SQL statements related to SELECT are also included in this section. Spark also provides the ability to generate logical and physical plan for a given query using EXPLAIN statement.