handle explain like sqlite

[TcMits]

related #1392

limbo:

limbo> CREATE TABLE dynamic_rodrigues (bountiful_beyerarnesen INTEGER,stunning_workers REAL);
limbo> EXPLAIN SELECT * FROM dynamic_rodrigues; EXPLAIN SELECT * FROM dynamic_rodrigues;
addr  opcode             p1    p2    p3    p4             p5  comment
----  -----------------  ----  ----  ----  -------------  --  -------
0     Init               0     9     0                    0   Start at 9
1     OpenRead           0     2     0                    0   table=dynamic_rodrigues, root=2
2     Rewind             0     8     0                    0   Rewind dynamic_rodrigues
3       Column           0     0     1                    0   r[1]=dynamic_rodrigues.bountiful_beyerarnesen
4       Column           0     1     2                    0   r[2]=dynamic_rodrigues.stunning_workers
5       RealAffinity     2     0     0                    0
6       ResultRow        1     2     0                    0   output=r[1..2]
7     Next               0     3     0                    0
8     Halt               0     0     0                    0
9     Transaction        0     0     0                    0   write=false
10    Goto               0     1     0                    0

sqlite:

sqlite> CREATE TABLE dynamic_rodrigues (bountiful_beyerarnesen INTEGER,stunning_workers REAL);
sqlite> EXPLAIN SELECT * FROM dynamic_rodrigues; EXPLAIN SELECT * FROM dynamic_rodrigues;
addr  opcode         p1    p2    p3    p4             p5  comment
----  -------------  ----  ----  ----  -------------  --  -------------
0     Init           0     10    0                    0   Start at 10
1     OpenRead       0     2     0     2              0   root=2 iDb=0; dynamic_rodrigues
2     Explain        2     0     0     SCAN TABLE dynamic_rodrigues  0
3     Rewind         0     9     0                    0
4       Column         0     0     1                    0   r[1]=dynamic_rodrigues.bountiful_beyerarnesen
5       Column         0     1     2                    0   r[2]=dynamic_rodrigues.stunning_workers
6       RealAffinity   2     0     0                    0
7       ResultRow      1     2     0                    0   output=r[1..2]
8     Next           0     4     0                    1
9     Halt           0     0     0                    0
10    Transaction    0     0     1     0              1   usesStmtJournal=0
11    Goto           0     1     0                    0
addr  opcode         p1    p2    p3    p4             p5  comment
----  -------------  ----  ----  ----  -------------  --  -------------
0     Init           0     10    0                    0   Start at 10
1     OpenRead       0     2     0     2              0   root=2 iDb=0; dynamic_rodrigues
2     Explain        2     0     0     SCAN TABLE dynamic_rodrigues  0
3     Rewind         0     9     0                    0
4       Column         0     0     1                    0   r[1]=dynamic_rodrigues.bountiful_beyerarnesen
5       Column         0     1     2                    0   r[2]=dynamic_rodrigues.stunning_workers
6       RealAffinity   2     0     0                    0
7       ResultRow      1     2     0                    0   output=r[1..2]
8     Next           0     4     0                    1
9     Halt           0     0     0                    0
10    Transaction    0     0     1     0              1   usesStmtJournal=0
11    Goto           0     1     0                    0

because sqlite use step to run