Change default flatten parent-child separator to "_" #920
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koperagen reviewed Oct 15, 2024
| import org.jetbrains.kotlinx.dataframe.impl.api.flattenImpl | ||
| import kotlin.reflect.KProperty | ||
| | ||
| public const val FLATTEN_DEFAULT_SEPARATOR: String = "_" |
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It makes parameter info popup less informative. I think it's better to have it inlined
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Come on IntelliJ XD. Don't make good coding practices harder
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Good c: Let's inline it before this issue is fixed?
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yes, a KDoc would also help, but it still doesn't show the value in the popup you show :/
Jolanrensen force-pushed the flatten-separator branch from 3a36758 to fbcb8ff Compare 
| Generated sources will be updated after merging this PR. |
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Fixes #911
While the discussion of separators in generated accessors is for later, this PR at least fixes the case for flatten.
Given a DataFrame with
df.group.child1anddf.group.child2. CallingflattenwithkeepParentNameForColumnswill introduceflatDf.group_child1andflatDf.group_child2by default now.This makes it a bit easier compared to the previous default with "." which made the flattened column name "group.child1" and the accessor
flatDf`.`group child1`.