[spark] branch master updated: [SPARK-31569][SQL][DOCS] Add links to subsections in SQL Reference main page

[srowen]

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The following commit(s) were added to refs/heads/master by this push:
     new 7735db2a2 [SPARK-31569][SQL][DOCS] Add links to subsections in SQL 
Reference main page
7735db2a2 is described below

commit 7735db2a273edf208ae50e88926c9f7a77e5dbac
Author: Huaxin Gao <huax...@us.ibm.com>
AuthorDate: Mon Apr 27 09:45:00 2020 -0500

    [SPARK-31569][SQL][DOCS] Add links to subsections in SQL Reference main page
    
    ### What changes were proposed in this pull request?
    Add links to subsections in SQL Reference main page
    
    ### Why are the changes needed?
    Make SQL Reference complete
    
    ### Does this PR introduce any user-facing change?
    Yes
    before:
    <img width="1050" alt="Screen Shot 2020-04-26 at 10 52 42 PM" 
src="https://user-images.githubusercontent.com/13592258/80338238-a9551080-8810-11ea-8ae8-d6707fde2cac.png";>
    
    after:
    <img width="1050" alt="Screen Shot 2020-04-26 at 10 51 58 PM" 
src="https://user-images.githubusercontent.com/13592258/80338241-ac500100-8810-11ea-8518-95c4f8c0a2eb.png";>
    
    ### How was this patch tested?
    Manually build and check.
    
    Closes #28360 from huaxingao/sql-ref.
    
    Authored-by: Huaxin Gao <huax...@us.ibm.com>
    Signed-off-by: Sean Owen <sro...@gmail.com>
---
 docs/sql-ref.md | 26 ++++++++++++++++++++------
 1 file changed, 20 insertions(+), 6 deletions(-)

diff --git a/docs/sql-ref.md b/docs/sql-ref.md
index 6c57b0d6..db51fe1 100644
--- a/docs/sql-ref.md
+++ b/docs/sql-ref.md
@@ -1,7 +1,7 @@
 ---
 layout: global
-title: Reference
-displayTitle: Reference
+title: SQL Reference
+displayTitle: SQL Reference
 license: |
   Licensed to the Apache Software Foundation (ASF) under one or more
   contributor license agreements.  See the NOTICE file distributed with
@@ -19,7 +19,21 @@ license: |
   limitations under the License.
 ---
 
-Spark SQL is Apache Spark's module for working with structured data.
-This guide is a reference for Structured Query Language (SQL) for Apache 
-Spark. This document describes the SQL constructs supported by Spark in detail
-along with usage examples when applicable.
+Spark SQL is Apache Spark's module for working with structured data. This 
guide is a reference for Structured Query Language (SQL) and includes syntax, 
semantics, keywords, and examples for common SQL usage. It contains information 
for the following topics:
+
+ * [Data Types](sql-ref-datatypes.html)
+ * [Identifiers](sql-ref-identifier.html)
+ * [Literals](sql-ref-literals.html)
+ * [Null Semanitics](sql-ref-null-semantics.html)
+ * [ANSI Compliance](sql-ref-ansi-compliance.html)
+ * [SQL Syntax](sql-ref-syntax.html)
+   * [DDL Statements](sql-ref-syntax-ddl.html)
+   * [DML Statements](sql-ref-syntax-ddl.html)
+   * [Data Retrieval Statements](sql-ref-syntax-qry.html)
+   * [Auxiliary Statements](sql-ref-syntax-aux.html)
+ * [Functions](sql-ref-functions.html)
+   * [Built-in Functions](sql-ref-functions-builtin.html)
+   * [Scalar User-Defined Functions (UDFs)](sql-ref-functions-udf-scalar.html)
+   * [User-Defined Aggregate Functions 
(UDAFs)](sql-ref-functions-udf-aggregate.html)
+   * [Integration with Hive UDFs/UDAFs/UDTFs](sql-ref-functions-udf-hive.html)
+ * [Datetime Pattern](sql-ref-datetime-pattern.html)


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