Revert "[feature](function) add json->operator convert to json_extract (#19899)"
because it conflict with lambda syntax
This reverts commit f54a068d82e88e8535f3ed55a4224886b752e46b.
UNIX_TIMESTAMP function data format parameter supports 'yyyy-MM-dd HH:mm:ss'
The implementation is the same as the date_format function
before:
```sql
mysql> select UNIX_TIMESTAMP('2023-09-18 00:00:00','yyyy-MM-dd HH:mm:ss');
+--------------------------------------------------------------+
| unix_timestamp('2023-09-18 00:00:00', 'yyyy-MM-dd HH:mm:ss') |
+--------------------------------------------------------------+
| NULL |
+--------------------------------------------------------------+
1 row in set (0.04 sec)
```
now:
```sql
mysql> select UNIX_TIMESTAMP('2023-09-18 00:00:00','yyyy-MM-dd HH:mm:ss');
+------------+
| 1694966400 |
+------------+
| 1694966400 |
+------------+
1 row in set (0.01 sec)
```
now we make error if we deal with leading zeros in decimal value , type_precision >= precision will make value overflow and DCHECK will fail , so if here has leading zero we should only make type_precision > precision to make value right
Now we can not support streamload with column which is map/array nested map/array
serde can do this now , so we can replace it
Notice. if item data in complex type data is empty we just return error, instead of makeup default value , because now we can not define right default for complex type
This function requires one arguments just as ARRAY_AGG(col) and col means the column whose values you want to aggregate.
This function Aggregates the values including NULL in a column into an array and returns a value of the ARRAY data type.
fix array index func with decimal
in old analyzer when sql with array_position or array_contains with decimal , may loss precision to which will make result wrong
FEATURE:
1. enable array type in Nereids
2. support generice on function signature
3. support array and map type in type coercion and type check
4. add element_at and element_slice syntax in Nereids parser
REFACTOR:
1. remove AbstractDataType
BUG FIX:
1. remove FROM from nonReserved keyword list
TODO:
1. support lambda expression
2. use Nereids' way do function type coercion
3. use castIfnotSame when do implict cast on BoundFunction
4. let AnyDataType type coercion do same thing as function type coercion
5. add below array function
- array_apply
- array_concat
- array_filter
- array_sortby
- array_exists
- array_first_index
- array_last_index
- array_count
- array_shuffle shuffle
- array_pushfront
- array_pushback
- array_repeat
- array_zip
- reverse
- concat_ws
- split_by_string
- explode
- bitmap_from_array
- bitmap_to_array
- multi_search_all_positions
- multi_match_any
- tokenize
if we write sql with : `select cast(array() as array<varchar(10)>)`
castexpr in fe will call analyze() with `Type.matchExactType(childType, type, true);`
here array type only check contains_null , but should check inner type to make array matchExactType right
if we write sql with : select array(1.0,2.0,null, null,2.0)
here will pass arg type with uint8 to be which does not match array() func sign with deicmal, and make be core. so here should cast from be and make null tag to cast decimal type
This function can be used to replace bitmap_union(to_bitmap(expr))， because bitmap_union(to_bitmap(expr)) need create many many small bitmaps firstly and then merge them into a single bitmap.
bitmap_agg will convert the column value into a bitmap directly. Its performance is better than bitmap_union(to_bitmap(expr)) . In our test , there is about 30% improvement.
