libsql-wal 0.1.0-alpha.1

wal implementation for libsql
Documentation 
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  DROP TABLE IF EXISTS t1;
  CREATE TABLE t1(a INTEGER PRIMARY KEY, b INTEGER);
  INSERT INTO t1 VALUES
   (1, 7), (2, 3), (3, 5), (4, 30), (5, 26), (6, 23), (7, 27),
   (8, 3), (9, 17), (10, 26), (11, 33), (12, 25), (13, NULL), (14, 47),
   (15, 36), (16, 13), (17, 45), (18, 31), (19, 11), (20, 36), (21, 37),
   (22, 21), (23, 22), (24, 14), (25, 16), (26, 3), (27, 7), (28, 29),
   (29, 50), (30, 38), (31, 3), (32, 36), (33, 12), (34, 4), (35, 46),
   (36, 3), (37, 48), (38, 23), (39, NULL), (40, 24), (41, 5), (42, 46),
   (43, 11), (44, NULL), (45, 18), (46, 25), (47, 15), (48, 18), (49, 23);


  SELECT sum(b) FROM t1


  SELECT sum(b) FILTER (WHERE a<10) FROM t1


  SELECT count(DISTINCT b) FROM t1


  SELECT count(DISTINCT b) FILTER (WHERE a!=19) FROM t1


  SELECT min(b) FILTER (WHERE a>19),
         min(b) FILTER (WHERE a>0),
         max(a+b) FILTER (WHERE a>19),
         max(b+a) FILTER (WHERE a BETWEEN 10 AND 40)
  FROM t1;


  SELECT min(b),
         min(b),
         max(a+b),
         max(b+a)
  FROM t1
  GROUP BY (a%10)
  ORDER BY 1, 2, 3, 4;


  SELECT min(b) FILTER (WHERE a>19),
         min(b) FILTER (WHERE a>0),
         max(a+b) FILTER (WHERE a>19),
         max(b+a) FILTER (WHERE a BETWEEN 10 AND 40)
  FROM t1
  GROUP BY (a%10)
  ORDER BY 1, 2, 3, 4;


  SELECT sum(a+b) FILTER (WHERE a=NULL) FROM t1


  SELECT (a%5) FROM t1 GROUP BY (a%5) 
  HAVING sum(b) FILTER (WHERE b<20) > 34
  ORDER BY 1


  SELECT (a%5), sum(b) FILTER (WHERE b<20) AS bbb
  FROM t1
  GROUP BY (a%5) HAVING sum(b) FILTER (WHERE b<20) >34
  ORDER BY 1


  SELECT (a%5), sum(b) FILTER (WHERE b<20) AS bbb
  FROM t1
  GROUP BY (a%5) HAVING sum(b) FILTER (WHERE b<20) >34
  ORDER BY 2


  SELECT (a%5), 
    sum(b) FILTER (WHERE b<20) AS bbb,
    count(distinct b) FILTER (WHERE b<20 OR a=13) AS ccc
  FROM t1 GROUP BY (a%5)
  ORDER BY 2


  SELECT 
    string_agg(CAST(b AS TEXT), '_') FILTER (WHERE b%2!=0),
    group_concat(CAST(b AS TEXT), '_') FILTER (WHERE b%2!=1),
    count(*) FILTER (WHERE b%2!=0),
    count(*) FILTER (WHERE b%2!=1)
  FROM t1;


  SELECT 
    a/5,
    sum(b) FILTER (WHERE a%5=0),
    sum(b) FILTER (WHERE a%5=1),
    sum(b) FILTER (WHERE a%5=2),
    sum(b) FILTER (WHERE a%5=3),
    sum(b) FILTER (WHERE a%5=4)
  FROM t1 GROUP BY (a/5) ORDER BY 1;