Support array type in primary and unique key.

[Linkerist]

before this PR:

mysql> create table t1(id bigint not null, ids array<int>) primary key(id) distributed by hash(id);
ERROR 1064 (HY000): Invalid aggregate function 'REPLACE' for 'ids'
mysql> create table t2(id bigint not null, ids array<int>) unique key(id) distributed by hash(id);
ERROR 1064 (HY000): Invalid aggregate function 'REPLACE' for 'ids'
mysql>

after this PR:

mysql> create table t1(id bigint not null, ids array<int>) primary key(id) distributed by hash(id);
Query OK, 0 rows affected (0.11 sec)

mysql> desc t1;
+-------+------------+------+-------+---------+-------+
| Field | Type       | Null | Key   | Default | Extra |
+-------+------------+------+-------+---------+-------+
| id    | BIGINT     | No   | true  | NULL    |       |
| ids   | ARRAY<INT> | Yes  | false | NULL    |       |
+-------+------------+------+-------+---------+-------+
2 rows in set (0.00 sec)

mysql> create table t2(id bigint not null, ids array<int>) unique key(id) distributed by hash(id);
Query OK, 0 rows affected (0.13 sec)

mysql> desc t2;
+-------+------------+------+-------+---------+-------+
| Field | Type       | Null | Key   | Default | Extra |
+-------+------------+------+-------+---------+-------+
| id    | BIGINT     | No   | true  | NULL    |       |
| ids   | ARRAY<INT> | Yes  | false | NULL    |       |
+-------+------------+------+-------+---------+-------+
2 rows in set (0.01 sec)

mysql>

ATT, resolve #1715

[sduzh]

|| (aggregateType.isReplaceFamily() && type.isArrayType())
IMO, it's better to place this check inside ggregateType.checkCompatibility

[Linkerist]

the checkCompatibility is a simply table driven method, it check primitive types, the business logic of isArrayType, isHllType, isBitmapType, et al. is processed in analyze method right here.

[Linkerist]

changed.

[sduzh]

Could you please give more test results on the reads and writes on array columns?

[sduzh]

@kangkaisen @Seaven PTAL