Infer the Kotlin type of bind parameter, if possible, or fail with a … #3413
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…better error message
AlecKazakova
approved these changes
Aug 6, 2022
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This might also fix the following, right? CREATE TABLE directory (
id TEXT NOT NULL PRIMARY KEY,
refreshOnStartUp INTEGER AS Boolean
);
CREATE TABLE channel (
id TEXT NOT NULL PRIMARY KEY,
refreshOnStartUp INTEGER AS Boolean,
directoryId TEXT
);
myQuery:
SELECT channel.*
FROM channel
LEFT JOIN directory
ON channel.directoryId = directory.id
WHERE COALESCE(channel.refreshOnStartUp, directory.refreshOnStartUp, :refreshOnStartUp) = 1
;Currently, I'm getting: |
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@vanniktech Nope, because coalesce supports many different sql types: But you will get a better error message indicating you to use CAST :D |
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Alright, I ended up casting now anyways. Would not it still be possible to infer the type? Both Also, I can't seem to write I need to use |
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Maybe it is possible to infer the kotlin type with multiple possible sql types too, when the corresponding sql type have the same kotlin representation, eg tiny int uses Int/Long not Short etc Update: They do use different Kotlin types |
@vanniktech Yes, it must be valid SQL, not sqldelight AS Kotlin
Sounds possible, but I would also emit a warning
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Why the warning? You can see the return type in the generated code. |
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Okay, that's true :D I'd just prevent wrong questions a la "my Kotlin type is wrong" because people forget CAST, including me |
Closed
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Created #3416 for this |
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…better error message
Fixes #3407 with a better error message
The compiler can now infer the Kotlin type of a bind parameter, if
encapsulatingTypehas exactly 1 sql type. This is used forCONCAT: eg https://github.com/cashapp/sqldelight/blob/02edf13f390229d3eb8986b5c408fd795a085e0f/dialects/mysql/src/main/kotlin/app/cash/sqldelight/dialects/mysql/MySqlTypeResolver.kt#L55