subject:"\[GitHub\] \[spark\] huaxingao commented on a change in pull request #28332\: \[SPARK\-31556\]\[SQL\]\[DOCS\] Document LIKE clause in SQL Reference"

[GitHub] [spark] huaxingao commented on a change in pull request #28332: [SPARK-31556][SQL][DOCS] Document LIKE clause in SQL Reference

2020-04-25 Thread GitBox



huaxingao commented on a change in pull request #28332:
URL: https://github.com/apache/spark/pull/28332#discussion_r415173038



##
File path: docs/sql-ref-syntax-qry-select-like.md
##
@@ -0,0 +1,120 @@
+---
+layout: global
+title: LIKE Predicate
+displayTitle: LIKE Predicate
+license: |
+  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
+
+A LIKE predicate is used to search for a specific pattern.
+
+### Syntax
+
+{% highlight sql %}
+[ NOT ] { LIKE search_pattern [ ESCAPE esc_char ] | RLIKE regex_pattern }
+{% endhighlight %}
+
+### Parameters
+
+
+  search_pattern
+  
+Specifies a string pattern to be searched by the LIKE clause. 
It can contain special pattern-matching characters:
+
+  % matches zero or more characters.
+  _ matches exactly one character.
+
+  
+
+
+  esc_char
+  
+Specifies the escape character. The default escape character is 
\.
+  
+
+
+  regex_pattern
+  
+Specifies a regular expression search pattern to be searched by the 
RLIKE clause.
+  
+
+
+### Examples
+
+{% highlight sql %}
+CREATE TABLE person (id INT, name STRING, age INT);
+INSERT INTO person VALUES
+(100, 'John', 30),
+(200, 'Mary', NULL),
+(300, 'Mike', 80),
+(400, 'Dan',  50),
+(500, 'Evan_w', 16);
+
+SELECT * FROM person WHERE name LIKE 'M%';
++---+++
+| id|name| age|
++---+++
+|300|Mike|  80|
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name LIKE 'M_ry';
++---+++
+| id|name| age|
++---+++
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name NOT LIKE 'M_ry';
++---+--+---+
+| id|  name|age|
++---+--+---+
+|500|Evan_W| 16|
+|300|  Mike| 80|
+|100|  John| 30|
+|400|   Dan| 50|
++---+--+---+
+
+SELECT * FROM person WHERE name RLIKE '[MD]';
++---+++
+| id|name| age|
++---+++
+|300|Mike|  80|
+|400| Dan|  50|
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name LIKE '%\_%';

Review comment:
   I am not sure to put ```%\_%``` or ```%\\_%```
   spark-sql takes one `\`
   while spark shell requires two `\`
   ```
   scala> sql("SELECT * FROM person WHERE name LIKE '%\_%'").show()
   :1: error: invalid escape character
  sql("SELECT * FROM person WHERE name LIKE '%\_%'").show()
   ^
   
   ```
   





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[GitHub] [spark] huaxingao commented on a change in pull request #28332: [SPARK-31556][SQL][DOCS] Document LIKE clause in SQL Reference

2020-04-25 Thread GitBox



huaxingao commented on a change in pull request #28332:
URL: https://github.com/apache/spark/pull/28332#discussion_r415166246



##
File path: docs/sql-ref-syntax-qry-select-like.md
##
@@ -0,0 +1,113 @@
+---
+layout: global
+title: LIKE Predicate
+displayTitle: LIKE Predicate
+license: |
+  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
+
+A LIKE predicate is used to search for a specific pattern.
+
+### Syntax
+
+{% highlight sql %}
+[ NOT ] { LIKE search_pattern [ ESCAPE esc_char ] | RLIKE regex_pattern }
+{% endhighlight %}
+
+### Parameters
+
+
+  search_pattern
+  
+Specifies a string pattern to be searched by the LIKE clause. 
It can contain special pattern-matching characters:
+
+  % matches zero or more characters.
+  _ matches exactly one character.
+
+  
+
+
+  esc_char
+  
+Specifies the escape character.
+  
+
+
+  regex_pattern
+  
+Specifies a regular expression search pattern to be searched by the 
RLIKE clause.
+  
+
+
+### Examples
+
+{% highlight sql %}
+CREATE TABLE person (id INT, name STRING, age INT);
+INSERT INTO person VALUES
+(100, 'John', 30),
+(200, 'Mary', NULL),
+(300, 'Mike', 80),
+(400, 'Dan',  50),
+(500, 'Evan_w', 16);
+
+SELECT * FROM person WHERE name LIKE 'M%';
++---+++
+| id|name| age|
++---+++
+|300|Mike|  80|
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name LIKE 'M_ry';
++---+++
+| id|name| age|
++---+++
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name NOT LIKE 'M_ry';
++---+--+---+
+| id|  name|age|
++---+--+---+
+|500|Evan_W| 16|
+|300|  Mike| 80|
+|100|  John| 30|
+|400|   Dan| 50|
++---+--+---+
+
+SELECT * FROM person WHERE name RLIKE '[MD]';
++---+++
+| id|name| age|
++---+++
+|300|Mike|  80|
+|400| Dan|  50|
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name LIKE '%$_%' ESCAPE '$';
++---+--+---+
+| id|  name|age|
++---+--+---+
+|500|Evan_W| 16|
++---+--+---+
+{% endhighlight %}
+
+### Related Statements
+
+ * [SELECT](sql-ref-syntax-qry-select.html)
+ * [WHERE Clause](sql-ref-syntax-qry-select-where.html)

Review comment:
   LIKE ALL and LIKE ANY can be added to this page too later. I don't want 
to include these two now because this PR is for 3.0.
   





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[GitHub] [spark] huaxingao commented on a change in pull request #28332: [SPARK-31556][SQL][DOCS] Document LIKE clause in SQL Reference

2020-04-25 Thread GitBox



huaxingao commented on a change in pull request #28332:
URL: https://github.com/apache/spark/pull/28332#discussion_r415165624



##
File path: docs/sql-ref-syntax-qry-select-like.md
##
@@ -0,0 +1,113 @@
+---
+layout: global
+title: LIKE Predicate
+displayTitle: LIKE Predicate
+license: |
+  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
+
+A LIKE predicate is used to search for a specific pattern.
+
+### Syntax
+
+{% highlight sql %}
+[ NOT ] { LIKE search_pattern [ ESCAPE esc_char ] | RLIKE regex_pattern }
+{% endhighlight %}
+
+### Parameters
+
+
+  search_pattern
+  
+Specifies a string pattern to be searched by the LIKE clause. 
It can contain special pattern-matching characters:
+
+  % matches zero or more characters.
+  _ matches exactly one character.
+
+  
+
+
+  esc_char
+  
+Specifies the escape character.
+  
+
+
+  regex_pattern
+  
+Specifies a regular expression search pattern to be searched by the 
RLIKE clause.
+  
+
+
+### Examples
+
+{% highlight sql %}
+CREATE TABLE person (id INT, name STRING, age INT);
+INSERT INTO person VALUES
+(100, 'John', 30),
+(200, 'Mary', NULL),
+(300, 'Mike', 80),
+(400, 'Dan',  50),
+(500, 'Evan_w', 16);
+
+SELECT * FROM person WHERE name LIKE 'M%';
++---+++
+| id|name| age|
++---+++
+|300|Mike|  80|
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name LIKE 'M_ry';
++---+++
+| id|name| age|
++---+++
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name NOT LIKE 'M_ry';
++---+--+---+
+| id|  name|age|
++---+--+---+
+|500|Evan_W| 16|
+|300|  Mike| 80|
+|100|  John| 30|
+|400|   Dan| 50|
++---+--+---+
+
+SELECT * FROM person WHERE name RLIKE '[MD]';
++---+++
+| id|name| age|
++---+++
+|300|Mike|  80|
+|400| Dan|  50|
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name LIKE '%$_%' ESCAPE '$';
++---+--+---+
+| id|  name|age|
++---+--+---+
+|500|Evan_W| 16|
++---+--+---+
+{% endhighlight %}
+
+### Related Statements
+
+ * [SELECT](sql-ref-syntax-qry-select.html)
+ * [WHERE Clause](sql-ref-syntax-qry-select-where.html)

Review comment:
   https://docs.oracle.com/cd/B13789_01/server.101/b10759/conditions016.htm
   https://docs.snowflake.com/en/sql-reference/functions/like.html





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[GitHub] [spark] huaxingao commented on a change in pull request #28332: [SPARK-31556][SQL][DOCS] Document LIKE clause in SQL Reference

2020-04-25 Thread GitBox



huaxingao commented on a change in pull request #28332:
URL: https://github.com/apache/spark/pull/28332#discussion_r415162543



##
File path: docs/sql-ref-syntax-qry-select-like.md
##
@@ -0,0 +1,113 @@
+---
+layout: global
+title: LIKE Predicate
+displayTitle: LIKE Predicate
+license: |
+  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
+
+A LIKE predicate is used to search for a specific pattern.
+
+### Syntax
+
+{% highlight sql %}
+[ NOT ] { LIKE search_pattern [ ESCAPE esc_char ] | RLIKE regex_pattern }
+{% endhighlight %}
+
+### Parameters
+
+
+  search_pattern
+  
+Specifies a string pattern to be searched by the LIKE clause. 
It can contain special pattern-matching characters:
+
+  % matches zero or more characters.
+  _ matches exactly one character.
+
+  
+
+
+  esc_char
+  
+Specifies the escape character.
+  
+
+
+  regex_pattern
+  
+Specifies a regular expression search pattern to be searched by the 
RLIKE clause.
+  
+
+
+### Examples
+
+{% highlight sql %}
+CREATE TABLE person (id INT, name STRING, age INT);
+INSERT INTO person VALUES
+(100, 'John', 30),
+(200, 'Mary', NULL),
+(300, 'Mike', 80),
+(400, 'Dan',  50),
+(500, 'Evan_w', 16);
+
+SELECT * FROM person WHERE name LIKE 'M%';
++---+++
+| id|name| age|
++---+++
+|300|Mike|  80|
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name LIKE 'M_ry';
++---+++
+| id|name| age|
++---+++
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name NOT LIKE 'M_ry';
++---+--+---+
+| id|  name|age|
++---+--+---+
+|500|Evan_W| 16|
+|300|  Mike| 80|
+|100|  John| 30|
+|400|   Dan| 50|
++---+--+---+
+
+SELECT * FROM person WHERE name RLIKE '[MD]';
++---+++
+| id|name| age|
++---+++
+|300|Mike|  80|
+|400| Dan|  50|
+|200|Mary|null|
++---+++
+
+SELECT * FROM person WHERE name LIKE '%$_%' ESCAPE '$';
++---+--+---+
+| id|  name|age|
++---+--+---+
+|500|Evan_W| 16|
++---+--+---+
+{% endhighlight %}
+
+### Related Statements
+
+ * [SELECT](sql-ref-syntax-qry-select.html)
+ * [WHERE Clause](sql-ref-syntax-qry-select-where.html)

Review comment:
   I separated the LIKE predicate from the WHERE clause page. It seems 
better to me this way. It's also easier to add LIKE ANY and LIKE ALL later. 





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[GitHub] [spark] huaxingao commented on a change in pull request #28332: [SPARK-31556][SQL][DOCS] Document LIKE clause in SQL Reference

[GitHub] [spark] huaxingao commented on a change in pull request #28332: [SPARK-31556][SQL][DOCS] Document LIKE clause in SQL Reference

[GitHub] [spark] huaxingao commented on a change in pull request #28332: [SPARK-31556][SQL][DOCS] Document LIKE clause in SQL Reference

[GitHub] [spark] huaxingao commented on a change in pull request #28332: [SPARK-31556][SQL][DOCS] Document LIKE clause in SQL Reference

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