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ed929d2a0a
```console
limbo> create index p on products(price);
limbo> explain insert into products (name,price) values ('huh',32);
addr opcode p1 p2 p3 p4 p5 comment
---- ----------------- ---- ---- ---- ------------- -- -------
0 Init 0 17 0 0 Start at 17
1 OpenWriteAsync 0 273 0 0
2 OpenWriteAwait 0 0 0 0
3 String8 0 3 0 huh 0 r[3]='huh'
4 Integer 32 4 0 0 r[4]=32
5 OpenWriteAsync 1 297 0 0
6 OpenWriteAwait 0 0 0 0
7 NewRowId 0 1 0 0
8 MakeRecord 2 3 5 0 r[5]=mkrec(r[2..4])
9 InsertAsync 0 5 1 0
10 InsertAwait 0 0 0 0
11 Copy 4 6 0 0 r[6]=r[4]
12 Copy 1 7 0 0 r[7]=r[1]
13 MakeRecord 6 2 8 0 r[8]=mkrec(r[6..7])
14 IdxInsertAsync 1 8 6 0 key=r[8]
15 IdxInsertAwait 1 0 0 0
16 Halt 0 0 0 0
17 Transaction 0 1 0 0 write=true
18 Null 0 2 0 0 r[2]=NULL
19 Goto 0 1 0 0
```
When an insert happens, we need to be sure to insert into the index
btree as well.
Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>
Closes #1265