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Implement support for iif().

Browse source 
In sqlite, iif() looks like:

sqlite> create table iiftest(a int, b int, c int);
sqlite> explain select iif(a,b,c) from iiftest;
addr  opcode         p1    p2    p3    p4             p5  comment
----  -------------  ----  ----  ----  -------------  --  -------------
0     Init           0     11    0                    0   Start at 11
1     OpenRead       0     2     0     3              0   root=2 iDb=0; iiftest
2     Rewind         0     10    0                    0
3       Column         0     0     2                    0   r[2]= cursor 0 column 0
4       IfNot          2     7     1                    0
5       Column         0     1     1                    0   r[1]= cursor 0 column 1
6       Goto           0     8     0                    0
7       Column         0     2     1                    0   r[1]= cursor 0 column 2
8       ResultRow      1     1     0                    0   output=r[1]
9     Next           0     3     0                    1
10    Halt           0     0     0                    0
11    Transaction    0     0     1     0              1   usesStmtJournal=0
12    Goto           0     1     0                    0

And with this change, in limbo it looks like:

addr  opcode             p1    p2    p3    p4             p5  comment
----  -----------------  ----  ----  ----  -------------  --  -------
0     Init               0     14    0                    0   Start at 14
1     OpenReadAsync      0     2     0                    0   table=iiftest, root=2
2     OpenReadAwait      0     0     0                    0
3     RewindAsync        0     0     0                    0
4     RewindAwait        0     13    0                    0   Rewind table iiftest
5       Column           0     0     2                    0   r[2]=iiftest.a
6       IfNot            2     9     1                    0   if !r[2] goto 9
7       Column           0     1     1                    0   r[1]=iiftest.b
8       Goto             0     10    0                    0
9       Column           0     2     1                    0   r[1]=iiftest.c
10      ResultRow        1     1     0                    0   output=r[1]
11    NextAsync          0     0     0                    0
12    NextAwait          0     5     0                    0
13    Halt               0     0     0                    0
14    Transaction        0     0     0                    0
15    Goto               0     1     0                    0
This commit is contained in:
Alex Miller 2024-12-07 21:04:03 -08:00
parent 9bc3ccc394
commit 183ea8e362
5 changed files with 65 additions and 1 deletions
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3
core/function.rs
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@ -56,6 +56,7 @@ pub enum ScalarFunc {
ConcatWs,
Glob,
IfNull,
Iif,
Instr,
Like,
Abs,
@ -96,6 +97,7 @@ impl Display for ScalarFunc {
ScalarFunc::ConcatWs => "concat_ws".to_string(),
ScalarFunc::Glob => "glob".to_string(),
ScalarFunc::IfNull => "ifnull".to_string(),
ScalarFunc::Iif => "iif".to_string(),
ScalarFunc::Instr => "instr".to_string(),
ScalarFunc::Like => "like(2)".to_string(),
ScalarFunc::Abs => "abs".to_string(),
@ -174,6 +176,7 @@ impl Func {
"concat_ws" => Ok(Func::Scalar(ScalarFunc::ConcatWs)),
"glob" => Ok(Func::Scalar(ScalarFunc::Glob)),
"ifnull" => Ok(Func::Scalar(ScalarFunc::IfNull)),
"iif" => Ok(Func::Scalar(ScalarFunc::Iif)),
"instr" => Ok(Func::Scalar(ScalarFunc::Instr)),
"like" => Ok(Func::Scalar(ScalarFunc::Like)),
"abs" => Ok(Func::Scalar(ScalarFunc::Abs)),