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Posted to reviews@spark.apache.org by "srielau (via GitHub)" <gi...@apache.org> on 2023/08/12 05:31:42 UTC
[GitHub] [spark] srielau opened a new pull request, #42467: [SPARK-44780][DOC] SQL temporary variables
srielau opened a new pull request, #42467:
URL: https://github.com/apache/spark/pull/42467
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### What changes were proposed in this pull request?
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Document the previously pushed feature SQL temporary variables
### Why are the changes needed?
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If it's not documented, it doesn't exist....
### Does this PR introduce _any_ user-facing change?
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No
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build docs, verify HTML
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[GitHub] [spark] srielau commented on a diff in pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "srielau (via GitHub)" <gi...@apache.org>.
srielau commented on code in PR #42467:
URL: https://github.com/apache/spark/pull/42467#discussion_r1319157747
##########
docs/sql-ref-syntax-aux-set-var.md:
##########
@@ -0,0 +1,98 @@
+---
+layout: global
+title: SET VAR
+displayTitle: SET VAR
+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
+
+The `SET VAR` command sets a temporary variable which has been previously declared in the current session.
+
+To set a config variable or a hive variable use [SET](sql-ref-syntax-aux-conf-mgmt-set.html).
+
+### Syntax
+
+```sql
+SET { VAR | VARIABLE }
+ { variable_name = { expression | DEFAULT } |
Review Comment:
*gosh* I forgot.
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[GitHub] [spark] srielau commented on pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "srielau (via GitHub)" <gi...@apache.org>.
srielau commented on PR #42467:
URL: https://github.com/apache/spark/pull/42467#issuecomment-1675716918
@cloud-fan I think this is ready.
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[GitHub] [spark] cloud-fan commented on a diff in pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan commented on code in PR #42467:
URL: https://github.com/apache/spark/pull/42467#discussion_r1338044224
##########
docs/sql-ref-syntax-ddl-drop-variable.md:
##########
@@ -0,0 +1,66 @@
+---
+layout: global
+title: DROP TEMPORARY VARIABLE
+displayTitle: DROP TEMPORARY VARIABLE
+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
+
+The `DROP TEMPORARY` statement drops a temporary variable. An exception will
Review Comment:
```suggestion
The `DROP TEMPORARY VARIABLE` statement drops a temporary variable. An exception will
```
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[GitHub] [spark] cloud-fan commented on a diff in pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan commented on code in PR #42467:
URL: https://github.com/apache/spark/pull/42467#discussion_r1293027327
##########
docs/sql-ref-syntax-aux-set-var.md:
##########
@@ -0,0 +1,98 @@
+---
+layout: global
+title: SET VAR
+displayTitle: SET VAR
+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
+
+The `SET VAR` command sets a temporary variable which has been previously declared in the current session.
+
+To set a config variable or a hive variable use [SET](sql-ref-syntax-aux-conf-mgmt-set.html).
+
+### Syntax
+
+```sql
+SET { VAR | VARIABLE }
+ { variable_name = { expression | DEFAULT } |
Review Comment:
do we want to change the parser and forbid it?
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[GitHub] [spark] cloud-fan commented on a diff in pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan commented on code in PR #42467:
URL: https://github.com/apache/spark/pull/42467#discussion_r1293025786
##########
docs/sql-ref-syntax-ddl-declare-variable.md:
##########
@@ -0,0 +1,82 @@
+---
+layout: global
+title: DECLARE VARIABLE
+displayTitle: DECLARE VARIABLE
+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
+
+The `DECLARE VARIABLE` statement is used to create a temporary variable in Spark.
+Temporary variables are scoped at a session level.
+
+You can reference variables by their name everywhere constant expressions are allowed.
+Unless you qualify a variable with `session` or `system.session`, a variable is only resolved after
+Spark fails to resolve a name to a column or column alias.
+
+Temporary variables cannot be referenced in persisted objects such as persisted view,
+column default expressions, and generated column expressions.
+
+### Syntax
+
+```sql
+DECLARE [ OR REPLACE ] [ VARIABLE ]
+ variable_name [ data_type ] [ { DEFAULT | = } default_expr ]
+```
+
+### Parameters
+
+* **OR REPLACE**
+
+ If specified, a pre-existing temporary variable is replaced if it exists.
+
+* **variable_name**
+
+ Specifies a name for the variable to be created.
+ The function name may be optionally qualified with a `system`.`session` or `session`.
Review Comment:
```suggestion
The variable name may be optionally qualified with a `system`.`session` or `session`.
```
##########
docs/sql-ref-syntax-ddl-declare-variable.md:
##########
@@ -0,0 +1,82 @@
+---
+layout: global
+title: DECLARE VARIABLE
+displayTitle: DECLARE VARIABLE
+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
+
+The `DECLARE VARIABLE` statement is used to create a temporary variable in Spark.
+Temporary variables are scoped at a session level.
+
+You can reference variables by their name everywhere constant expressions are allowed.
+Unless you qualify a variable with `session` or `system.session`, a variable is only resolved after
+Spark fails to resolve a name to a column or column alias.
+
+Temporary variables cannot be referenced in persisted objects such as persisted view,
+column default expressions, and generated column expressions.
+
+### Syntax
+
+```sql
+DECLARE [ OR REPLACE ] [ VARIABLE ]
+ variable_name [ data_type ] [ { DEFAULT | = } default_expr ]
+```
+
+### Parameters
+
+* **OR REPLACE**
+
+ If specified, a pre-existing temporary variable is replaced if it exists.
+
+* **variable_name**
+
+ Specifies a name for the variable to be created.
+ The function name may be optionally qualified with a `system`.`session` or `session`.
+
+ **Syntax:** `[ system . [ session .] ] variable_name`
+
+* **data_type**
+
+ Optionally defines the data type of the variable.
+ If it is not specified the type is derived from the default expression.
+
+* **default_expr**
+
+ An optional expression used to initialize the value of the variable after declaration.
+ The expression is re-evaluated whenever the variable is reset to `DEFAULT` using
+ [SET VAR](sql-ref-syntax-aux-set-var.html).
+ If `data_type` is specified `default_expr` must be castable to the variable type.
+ If `data_type` is not specified you must specify a default and its type will become the type of
+ the variable.
+ If no default expression is given, the variable is initialized with `NULKL`.
Review Comment:
```suggestion
If no default expression is given, the variable is initialized with `NULL`.
```
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[GitHub] [spark] cloud-fan commented on a diff in pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan commented on code in PR #42467:
URL: https://github.com/apache/spark/pull/42467#discussion_r1293027030
##########
docs/sql-ref-syntax-aux-set-var.md:
##########
@@ -0,0 +1,98 @@
+---
+layout: global
+title: SET VAR
+displayTitle: SET VAR
+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
+
+The `SET VAR` command sets a temporary variable which has been previously declared in the current session.
+
+To set a config variable or a hive variable use [SET](sql-ref-syntax-aux-conf-mgmt-set.html).
+
+### Syntax
+
+```sql
+SET { VAR | VARIABLE }
+ { variable_name = { expression | DEFAULT } |
Review Comment:
After looking at the parser rule, I think we support `SET VAR a=1, b=2, ...`
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[GitHub] [spark] cloud-fan commented on pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan commented on PR #42467:
URL: https://github.com/apache/spark/pull/42467#issuecomment-1736708506
thanks, merging to master! (doc only, no need to test)
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[GitHub] [spark] srielau commented on a diff in pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "srielau (via GitHub)" <gi...@apache.org>.
srielau commented on code in PR #42467:
URL: https://github.com/apache/spark/pull/42467#discussion_r1319158360
##########
docs/sql-ref-syntax-aux-set-var.md:
##########
@@ -0,0 +1,98 @@
+---
+layout: global
+title: SET VAR
+displayTitle: SET VAR
+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
+
+The `SET VAR` command sets a temporary variable which has been previously declared in the current session.
+
+To set a config variable or a hive variable use [SET](sql-ref-syntax-aux-conf-mgmt-set.html).
+
+### Syntax
+
+```sql
+SET { VAR | VARIABLE }
+ { variable_name = { expression | DEFAULT } |
Review Comment:
```suggestion
{ variable_name = { expression | DEFAULT } [, ...] |
```
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[GitHub] [spark] cloud-fan closed pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "cloud-fan (via GitHub)" <gi...@apache.org>.
cloud-fan closed pull request #42467: [SPARK-44780][DOC] SQL temporary variables
URL: https://github.com/apache/spark/pull/42467
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[GitHub] [spark] srielau commented on a diff in pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "srielau (via GitHub)" <gi...@apache.org>.
srielau commented on code in PR #42467:
URL: https://github.com/apache/spark/pull/42467#discussion_r1319159080
##########
docs/sql-ref-syntax-aux-set-var.md:
##########
@@ -0,0 +1,98 @@
+---
+layout: global
+title: SET VAR
+displayTitle: SET VAR
+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
+
+The `SET VAR` command sets a temporary variable which has been previously declared in the current session.
+
+To set a config variable or a hive variable use [SET](sql-ref-syntax-aux-conf-mgmt-set.html).
+
+### Syntax
+
+```sql
+SET { VAR | VARIABLE }
+ { variable_name = { expression | DEFAULT } [, ...] |
Review Comment:
```suggestion
{ { variable_name = { expression | DEFAULT } } [, ...] |
```
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[GitHub] [spark] srielau commented on pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "srielau (via GitHub)" <gi...@apache.org>.
srielau commented on PR #42467:
URL: https://github.com/apache/spark/pull/42467#issuecomment-1710825401
OK, let's merge @cloud-fan
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[GitHub] [spark] srielau commented on pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "srielau (via GitHub)" <gi...@apache.org>.
srielau commented on PR #42467:
URL: https://github.com/apache/spark/pull/42467#issuecomment-1675716717
<img width="736" alt="Screenshot 2023-08-11 at 10 26 54 PM" src="https://github.com/apache/spark/assets/3514644/1c6e9daa-27d9-458c-8a86-b15b7b25518e">
<img width="749" alt="Screenshot 2023-08-11 at 10 24 33 PM" src="https://github.com/apache/spark/assets/3514644/c9bbced2-f269-480a-b8bd-a03d8a310bf1">
<img width="879" alt="Screenshot 2023-08-11 at 10 22 55 PM" src="https://github.com/apache/spark/assets/3514644/46f29e4b-0a4f-4389-a9d0-15742a5e2c6b">
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[GitHub] [spark] HyukjinKwon commented on pull request #42467: [SPARK-44780][DOC] SQL temporary variables
Posted by "HyukjinKwon (via GitHub)" <gi...@apache.org>.
HyukjinKwon commented on PR #42467:
URL: https://github.com/apache/spark/pull/42467#issuecomment-1685562669
👍
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