Merge pull request #2623 from Junnplus/crc32-doc

[DOC] add doc for crc32 function

Author: databend-bot

website/databend/docs/sqlstatement/numeric-functions/crc32.md

@@ -0,0 +1,58 @@
+---
+id: numeric-crc32
+title: CRC32
+---
+
+Returns the CRC32 checksum of a string.
+
+## Syntax
+
+```sql
+CRC32(x)
+```
+
+## Arguments
+
+| Arguments   | Description |
+| ----------- | ----------- |
+| x | The argument is expected to be a string and (if possible) is treated as one if it is not. |
+
+## Return Type
+
+UInt32.
+
+## Examples
+
+```
+mysql> SELECT CRC32('MySQL');
++----------------+
+| CRC32('MySQL') |
++----------------+
+|     3259397556 |
++----------------+
+1 row in set (0.09 sec)
+
+mysql> SELECT CRC32('mysql');
++----------------+
+| CRC32('mysql') |
++----------------+
+|     2501908538 |
++----------------+
+1 row in set (0.01 sec)
+
+mysql> SELECT CRC32(NULL);
++-------------+
+| CRC32(NULL) |
++-------------+
+|        NULL |
++-------------+
+1 row in set (0.00 sec)
+
+mysql> SELECT CRC32(12);
++------------+
+| CRC32(12)  |
++------------+
+| 1330857165 |
++------------+
+1 row in set (0.01 sec)
+```

website/databend/mkdocs.yml

@@ -202,6 +202,7 @@ nav:
           - COS: sqlstatement/numeric-functions/cos.md
           - TAN: sqlstatement/numeric-functions/tan.md
           - COT: sqlstatement/numeric-functions/cot.md
+          - CRC32: sqlstatement/numeric-functions/crc32.md
       - String Functions:
           - SUBSTRING: sqlstatement/string-functions/substring.md
       - Test Functions: