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### What changes were proposed in this pull request? Document Table-valued Function and Inline Table ### Why are the changes needed? To make SQL Reference complete ### Does this PR introduce any user-facing change? Yes <img width="1050" alt="Screen Shot 2020-04-11 at 5 34 25 PM" src="https://user-images.githubusercontent.com/13592258/79057852-cedff880-7c1a-11ea-9e1e-7882594ab573.png"> <img width="1050" alt="Screen Shot 2020-04-11 at 5 34 46 PM" src="https://user-images.githubusercontent.com/13592258/79057854-d4d5d980-7c1a-11ea-94cc-92ef1121fa43.png"> <img width="1050" alt="Screen Shot 2020-04-10 at 7 36 00 PM" src="https://user-images.githubusercontent.com/13592258/79033391-c2986480-7b62-11ea-9d0a-6c60de823256.png"> <img width="1051" alt="Screen Shot 2020-04-10 at 7 36 21 PM" src="https://user-images.githubusercontent.com/13592258/79033392-c5935500-7b62-11ea-88d4-e7d7812a7add.png"> <img width="1051" alt="Screen Shot 2020-04-11 at 5 09 48 PM" src="https://user-images.githubusercontent.com/13592258/79057555-6ba09700-7c17-11ea-9683-16bbde63a529.png"> Also, linked the newly added pages to select statement <img width="1050" alt="Screen Shot 2020-04-10 at 3 27 59 PM" src="https://user-images.githubusercontent.com/13592258/79027245-5147ba00-7b40-11ea-9b10-527fd9639958.png"> ### How was this patch tested? Manually build and check Closes #28185 from huaxingao/tvf. Authored-by: Huaxin Gao <huaxing@us.ibm.com> Signed-off-by: Sean Owen <srowen@gmail.com>
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| layout | title | displayTitle | license |
|---|---|---|---|
| global | Table-valued Functions (TVF) | Table-valued Functions (TVF) | 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 table-valued function (TVF) is a function that returns a relation or a set of rows.
Syntax
{% highlight sql %} function_name ( expression [ , ... ] ) [ table_alias ] {% endhighlight %}
Parameters
expression- Specifies a combination of one or more values, operators and SQL functions that results in a value.
table_alias-
Specifies a temporary name with an optional column name list.
Syntax:[ AS ] table_name [ ( column_name [ , ... ] ) ]
Supported Table-valued Functions
| Function | Argument Type(s) | Description |
|---|---|---|
| range ( end ) | Long | Creates a table with a single LongType column named id, containing rows in a range from 0 to end (exclusive) with step value 1. |
| range ( start, end ) | Long, Long | Creates a table with a single LongType column named id, containing rows in a range from start to end (exclusive) with step value 1. |
| range ( start, end, step ) | Long, Long, Long | Creates a table with a single LongType column named id, containing rows in a range from start to end (exclusive) with step value. |
| range ( start, end, step, numPartitions ) | Long, Long, Long, Int | Creates a table with a single LongType column named id, containing rows in a range from start to end (exclusive) with step value, with partition number numPartitions specified. |
Examples
{% highlight sql %} -- range call with end SELECT * FROM range(6 + cos(3)); +---+ | id| +---+ | 0| | 1| | 2| | 3| | 4| +---+
-- range call with start and end SELECT * FROM range(5, 10); +---+ | id| +---+ | 5| | 6| | 7| | 8| | 9| +---+
-- range call with numPartitions SELECT * FROM range(0, 10, 2, 200); +---+ | id| +---+ | 0| | 2| | 4| | 6| | 8| +---+
-- range call with a table alias SELECT * FROM range(5, 8) AS test; +---+ | id| +---+ | 5| | 6| | 7| +---+ {% endhighlight %}