Support distinct on

[ea-rus]

Example query:

SELECT DISTINCT ON (t.hostname) * FROM tags t 

[github-actions]

Coverage Report

File	Stmts	Miss	Cover	Missing
mindsdb_sql_parser
__about__.py	10	10	0%	1–10
__init__.py	116	21	82%	43, 47, 93, 110, 134–153, 160–161
lexer.py	272	21	92%	355, 357, 359, 371, 373, 375, 381–399
logger.py	19	4	79%	14, 17, 23, 26
parser.py	1054	28	97%	120, 124, 263, 288, 385, 571, 588, 612–613, 812, 866, 943, 1034, 1087, 1097, 1135–1136, 1165, 1176, 1259, 1335, 1374, 1410, 1921, 1929, 1982–1985
utils.py	46	4	91%	73–79
mindsdb_sql_parser/ast
base.py	36	5	86%	13, 28, 31, 46, 51
create.py	76	12	84%	22–30, 91–96
drop.py	52	2	96%	10, 13
insert.py	63	4	94%	39–41, 46
show.py	48	1	98%	18
update.py	53	5	91%	40–42, 75–76
mindsdb_sql_parser/ast/mindsdb
knowledge_base.py	46	1	98%	79
mindsdb_sql_parser/ast/select
case.py	38	2	95%	19, 22
constant.py	36	1	97%	23
data.py	11	4	64%	10–12, 15, 19
identifier.py	69	8	88%	47, 88–93, 100
native_query.py	13	1	92%	25
operation.py	139	4	97%	56, 65, 177, 201
parameter.py	11	1	91%	10
select.py	101	3	97%	155–160
star.py	12	2	83%	8–9
TOTAL	3205	144	96%

Tests	Skipped	Failures	Errors	Time
283	0 💤	0 ❌	0 🔥	17.052s ⏱️