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### What changes were proposed in this pull request? A few improvements to the sql ref SELECT doc: 1. correct the syntax of SELECT query 2. correct the default of null sort order 3. correct the GROUP BY syntax 4. several minor fixes ### Why are the changes needed? refine document ### Does this PR introduce any user-facing change? N/A ### How was this patch tested? N/A Closes #27866 from cloud-fan/doc. Authored-by: Wenchen Fan <wenchen@databricks.com> Signed-off-by: Dongjoon Hyun <dongjoon@apache.org>
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| layout | title | displayTitle | license |
|---|---|---|---|
| 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. Spark also provides the
ability to generate logical and physical plan for a given query using
EXPLAIN statement.