I know Apache Phoenix will store all function metadata in SYSTEM.FUNCTION, but when I perform the query use following statement it will throw exception.
0: jdbc:phoenix:10.1.226.15:2181> select * from SYSTEM.FUNCTION;
Error: ERROR 604 (42P00): Syntax error. Mismatched input. Expecting "NAME", got "FUNCTION" at line 1, column 22. (state=42P00,code=604)
org.apache.phoenix.exception.PhoenixParserException: ERROR 604 (42P00): Syntax error. Mismatched input. Expecting "NAME", got "FUNCTION" at line 1, column 22.
at org.apache.phoenix.exception.PhoenixParserException.newException(PhoenixParserException.java:33)
or
0: jdbc:phoenix:10.1.226.15:2181> select * from FUNCTION;
Error: ERROR 601 (42P00): Syntax error. Encountered "FUNCTION" at line 1, column 15. (state=42P00,code=601)
org.apache.phoenix.exception.PhoenixParserException: ERROR 601 (42P00): Syntax error. Encountered "FUNCTION" at line 1, column 15.
The table FUNCTION exist in SYSTEM schema, but can not query, in other hand, the table CATALOG in SYSTEM schema I can perform statement and retrieves the right data.
0: jdbc:phoenix:10.1.226.15:2181> !tables
+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------+
| TABLE_CAT | TABLE_SCHEM | TABLE_NAME | TABLE_TYPE | REMARKS |
+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------+
| | SYSTEM | CATALOG | SYSTEM TABLE | |
| | SYSTEM | FUNCTION | SYSTEM TABLE | |
| | SYSTEM | SEQUENCE | SYSTEM TABLE | |
| | SYSTEM | STATS | SYSTEM TABLE | |
+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------+
0: jdbc:phoenix:10.1.226.15:2181> select * from system.catalog;
+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------+
| TENANT_ID | TABLE_SCHEM | TABLE_NAME | COLUMN_NAME | COLUMN_FAMILY |
+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------+
| | SYSTEM | CATALOG | | |
| | SYSTEM | CATALOG | ARRAY_SIZE | 0 |
| | SYSTEM | CATALOG | BUFFER_LENGTH | 0 |
....
Can somebody explain why?