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Merge 'Added 'likelihood' scalar function' from Sachin Kumar Singh

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The `likelihood(X,Y)` function returns argument X unchanged. The value Y
in likelihood(X,Y) must be a floating point constant between 0.0 and
1.0, inclusive.
```
sqlite> explain SELECT likelihood(42, 0.0);
addr  opcode         p1    p2    p3    p4             p5  comment
----  -------------  ----  ----  ----  -------------  --  -------------
0     Init           0     6     0                    0   Start at 6
1     Once           0     3     0                    0
2     Integer        42    2     0                    0   r[2]=42
3     Copy           2     1     0                    0   r[1]=r[2]
4     ResultRow      1     1     0                    0   output=r[1]
5     Halt           0     0     0                    0
6     Goto           0     1     0                    0
```
```
limbo> explain SELECT likelihood(42, 0.0);
addr  opcode             p1    p2    p3    p4             p5  comment
----  -----------------  ----  ----  ----  -------------  --  -------
0     Init               0     4     0                    0   Start at 4
1     Copy               2     1     0                    0   r[1]=r[2]
2     ResultRow          1     1     0                    0   output=r[1]
3     Halt               0     0     0                    0
4     Integer            42    2     0                    0   r[2]=42
5     Goto               0     1     0                    0
```

Closes #1303
This commit is contained in:
Pekka Enberg 2025-04-11 09:34:36 +03:00
commit d67e1b604b
5 changed files with 134 additions and 2 deletions
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3
core/function.rs
View file

@ -294,6 +294,7 @@ pub enum ScalarFunc {
Printf,
Likely,
TimeDiff,
Likelihood,
}
impl Display for ScalarFunc {
@ -350,6 +351,7 @@ impl Display for ScalarFunc {
Self::Printf => "printf".to_string(),
Self::Likely => "likely".to_string(),
Self::TimeDiff => "timediff".to_string(),
Self::Likelihood => "likelihood".to_string(),
};
write!(f, "{}", str)
}
@ -607,6 +609,7 @@ impl Func {
"sqlite_source_id" => Ok(Self::Scalar(ScalarFunc::SqliteSourceId)),
"replace" => Ok(Self::Scalar(ScalarFunc::Replace)),
"likely" => Ok(Self::Scalar(ScalarFunc::Likely)),
"likelihood" => Ok(Self::Scalar(ScalarFunc::Likelihood)),
#[cfg(feature = "json")]
"json" => Ok(Self::Json(JsonFunc::Json)),
#[cfg(feature = "json")]