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commit 94b444e3ec128e7a4daaaf4a49ceeeca9d886f1d
Author: Timo Walther <twal...@apache.org>
AuthorDate: Wed Oct 16 17:33:39 2019 +0200
[hotfix][docs] Add MAP data type docs
---
docs/dev/table/types.md | 38 ++++++++++++++++++++++++++++++++++++++
1 file changed, 38 insertions(+)
diff --git a/docs/dev/table/types.md b/docs/dev/table/types.md
index 13139ff..8a913bc 100644
--- a/docs/dev/table/types.md
+++ b/docs/dev/table/types.md
@@ -1005,6 +1005,43 @@ equivalent to `ARRAY<INT>`.
|:----------|:-----:|:------:|:----------------------------------|
|*t*`[]` | (X) | (X) | Depends on the subtype. *Default* |
+#### `MAP`
+
+Data type of an associative array that maps keys (including `NULL`) to values
(including `NULL`). A map
+cannot contain duplicate keys; each key can map to at most one value.
+
+There is no restriction of element types; it is the responsibility of the user
to ensure uniqueness.
+
+The map type is an extension to the SQL standard.
+
+**Declaration**
+
+<div class="codetabs" markdown="1">
+
+<div data-lang="SQL" markdown="1">
+{% highlight text %}
+MAP<kt, vt>
+{% endhighlight %}
+</div>
+
+<div data-lang="Java/Scala" markdown="1">
+{% highlight java %}
+DataTypes.MAP(kt, vt)
+{% endhighlight %}
+</div>
+
+</div>
+
+The type can be declared using `MAP<kt, vt>` where `kt` is the data type of
the key elements
+and `vt` is the data type of the value elements.
+
+**Bridging to JVM Types**
+
+| Java Type | Input | Output | Remarks |
+|:--------------------------------------|:-----:|:------:|:----------|
+| `java.util.Map<kt, vt>` | X | X | *Default* |
+| *subclass* of `java.util.Map<kt, vt>` | X | | |
+
#### `MULTISET`
Data type of a multiset (=bag). Unlike a set, it allows for multiple instances
for each of its
@@ -1042,6 +1079,7 @@ equivalent to `MULTISET<INT>`.
| Java Type | Input | Output | Remarks
|
|:-------------------------------------|:-----:|:------:|:---------------------------------------------------------|
|`java.util.Map<t, java.lang.Integer>` | X | X | Assigns each value
to an integer multiplicity. *Default* |
+| *subclass* of `java.util.Map<kt, java.lang.Integer>` | X | |
Assigns each value to an integer multiplicity. |
#### `ROW`
