[Enhancement] documents rebuild with Vuepress (#3408) (#3414)

docs/en/sql-reference/sql-functions/string-functions/split_part.md

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+---
+{
+    "title": "split_part",
+    "language": "en"
+}
+---
+
+<!-- 
+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.
+-->
+
+# split_part
+## Description
+### Syntax
+
+'VARCHAR split party (VARCHAR content, VARCHAR delimiter, INT field)'
+
+
+Returns the specified partition (counting from the beginning) by splitting the string according to the partitioner.
+
+## example
+
+```
+mysql> select split_part("hello world", " ", 1);
++----------------------------------+
+| split_part('hello world', ' ', 1) |
++----------------------------------+
+| hello                            |
++----------------------------------+
+
+
+mysql> select split_part("hello world", " ", 2);
++----------------------------------+
+| split_part('hello world', ' ', 2) |
++----------------------------------+
+| world                             |
++----------------------------------+
+
+mysql> select split_part("2019年7月8号", "月", 1);
++-----------------------------------------+
+| split_part('2019年7月8号', '月', 1)     |
++-----------------------------------------+
+| 2019年7                                 |
++-----------------------------------------+
+
+mysql> select split_part("abca", "a", 1);
++----------------------------+
+| split_part('abca', 'a', 1) |
++----------------------------+
+|                            |
++----------------------------+
+```
+##keyword
+SPLIT_PART,SPLIT,PART