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bf2e254a21
Built on top of, and currently targets, #350, _not_ main Closes #365 Examples: ``` limbo> explain select u.first_name, p.name from users u join products p on u.id = p.id order by u.id; addr opcode p1 p2 p3 p4 p5 comment ---- ----------------- ---- ---- ---- ------------- -- ------- 0 Init 0 15 0 0 Start at 15 1 OpenReadAsync 0 2 0 0 table=u, root=2 2 OpenReadAwait 0 0 0 0 3 OpenReadAsync 1 3 0 0 table=p, root=3 4 OpenReadAwait 0 0 0 0 5 RewindAsync 0 0 0 0 6 RewindAwait 0 14 0 0 Rewind table u 7 RowId 0 1 0 0 r[1]=u.rowid 8 SeekRowid 1 1 12 0 if (r[1]!=p.rowid) goto 12 9 Column 0 1 2 0 r[2]=u.first_name 10 Column 1 1 3 0 r[3]=p.name 11 ResultRow 2 2 0 0 output=r[2..3] 12 NextAsync 0 0 0 0 13 NextAwait 0 7 0 0 14 Halt 0 0 0 0 15 Transaction 0 0 0 0 16 Goto 0 1 0 0 ``` ``` limbo> explain select * from users where age > 80 order by age limit 5; addr opcode p1 p2 p3 p4 p5 comment ---- ----------------- ---- ---- ---- ------------- -- ------- 0 Init 0 23 0 0 Start at 23 1 OpenReadAsync 0 2 0 0 table=users, root=2 2 OpenReadAwait 0 0 0 0 3 OpenReadAsync 1 274 0 0 table=age_idx, root=274 4 OpenReadAwait 0 0 0 0 5 Integer 80 1 0 0 r[1]=80 6 SeekGT 1 22 1 0 7 DeferredSeek 1 0 0 0 8 RowId 0 2 0 0 r[2]=users.rowid 9 Column 0 1 3 0 r[3]=users.first_name 10 Column 0 2 4 0 r[4]=users.last_name 11 Column 0 3 5 0 r[5]=users.email 12 Column 0 4 6 0 r[6]=users.phone_number 13 Column 0 5 7 0 r[7]=users.address 14 Column 0 6 8 0 r[8]=users.city 15 Column 0 7 9 0 r[9]=users.state 16 Column 0 8 10 0 r[10]=users.zipcode 17 Column 0 9 11 0 r[11]=users.age 18 ResultRow 2 10 0 0 output=r[2..11] 19 DecrJumpZero 12 22 0 0 if (--r[12]==0) goto 22 20 NextAsync 1 0 0 0 21 NextAwait 1 7 0 0 22 Halt 0 0 0 0 23 Transaction 0 0 0 0 24 Integer 5 12 0 0 r[12]=5 25 Goto 0 1 0 0 ``` Closes #366