Comments (2)
You are absolutely right about nullability of aggregated functions, but I think that not all of them can return null value (count for example).
I've fixed it and add your test to ensure.
Also I have changed return value of avg function to BigDecimal and it's possible to provide scale to it (test also included).
from exposed.
That was quick. We are not quite there yet however. It only works because you .max()
on a nullable column.
This still fails:
@Test fun testGroupBy06() {
withCitiesAndUsers { cities, users, userData ->
val maxNullableId: Max<Int> = cities.id.max()
cities.slice(maxNullableId).selectAll()
.map { it[maxNullableId] }.let { result ->
assertTrue(result.size == 1)
assertNotNull(result.single())
}
cities.slice(maxNullableId).select { cities.id.isNull() }
.map { it[maxNullableId] }.let { result: List<Int?> ->
assertTrue(result.size == 1)
assertNull(result.single())
}
}
}
I would think all of the aggregate functions should return a nullable version of their types.
Also, about the Average function there seems to be a need for changing the type.
H2 docs says: "The returned value is of the same data type as the parameter."
PostgreSQL: "numeric for any integer-type argument, double precision for a floating-point argument, otherwise the same as the argument data type"
MySQL: "The SUM() and AVG() functions return a DECIMAL value for exact-value arguments (integer or DECIMAL), and a DOUBLE value for approximate-value arguments (FLOAT or DOUBLE)."
Im not sure if what the intersection with these statements is.. but at the very least is there a way of converting from an Int
column to a Double
column?
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