libenchao commented on a change in pull request #11461: [FLINK-16092][docs-zh]
Translate dev/table/functions/index.zh.md into Chinese
URL: https://github.com/apache/flink/pull/11461#discussion_r396051330
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File path: docs/dev/table/functions/index.zh.md
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@@ -24,74 +24,74 @@ specific language governing permissions and limitations
under the License.
-->
-Flink Table API & SQL empowers users to do data transformations with functions.
+Flink 允许用户在 Table API 和 SQL 中使用函数进行数据的转换。
* This will be replaced by the TOC
{:toc}
-Types of Functions
+函数类型
------------------
-There are two dimensions to classify functions in Flink.
+Flink 中的函数有两个划分标准。
-One dimension is system (or built-in) functions v.s. catalog functions. System
functions have no namespace and can be
-referenced with just their names. Catalog functions belong to a catalog and
database therefore they have catalog and database
-namespaces, they can be referenced by either fully/partially qualified name
(`catalog.db.func` or `db.func`) or just the
-function name.
+一个划分标准是：系统（内置）函数和 Catalog 函数。系统函数没有名称空间，只能通过其名称来进行引用。
+Catalog 函数属于 Catalog 和数据库，因此它们拥有 Catalog 和数据库命名空间。
+用户可以通过全/部分限定名（`catalog.db.func` 或 `db.func`）或者函数名
+来对 Catalog 函数进行引用。
-The other dimension is temporary functions v.s. persistent functions.
Temporary functions are volatile and only live up to
- lifespan of a session, they are always created by users. Persistent functions
live across lifespan of sessions, they are either
- provided by the system or persisted in catalogs.
-
-The two dimensions give Flink users 4 categories of functions:
+另一个划分标准是：临时函数和持久化函数。
+临时函数始终由用户创建，它容易改变并且仅在会话的生命周期内有效。
+持久化函数不是由系统提供，就是存储在 Catalog 中，它在会话的整个生命周期内都有效。
-1. Temporary system functions
-2. System functions
-3. Temporary catalog functions
-4. Catalog functions
+这两个划分标准给 Flink 用户提供了 4 种函数：
-Note that system functions always precede catalog's, and temporary functions
always precede persistent on their own dimension
-in function resolution order explained below.
+1. 临时性系统函数
+2. 系统函数
+3. 临时性 Catalog 函数
+4. Catalog 函数
-Referencing Functions
+请注意，系统函数始终优先于目录函数解析，临时函数始终优先于持久化函数解析，
Review comment:
`目录函数`这里应该是手误吧，我看其他地方都没有翻译`Catalog`
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