object ColumnAliaser
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def
apply(f: PartialFunction[(Int, ColumnName), String]): ColumnAliaser
Initializes an aliaser from a given partial function.
Initializes an aliaser from a given partial function.
ColumnAliaser({ case (1, cn) => "my_id" case (_, ColumnName(".foo", _)) => "prefix.foo" })
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def
notifyAll(): Unit
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def
perPositions(positions: Set[Int])(as: ((Int, ColumnName)) ⇒ String): ColumnAliaser
- positions
the column positions (>= 1)
- as
function to determine the alias for the matching columns
ColumnAliaser.perPositions((2 to 3).toSet) { case (2, _) => "prefix.foo" case _ => "bar" }
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def
toString(): String
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wait(arg0: Long): Unit
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def
withPattern(positions: Set[Int], prefix: String, suffix: String = ""): ColumnAliaser
- positions
the column positions (>= 1)
- prefix
the prefix to be prepended to the aliases of the matching columns
- suffix
the suffix to be appended to the aliases (default:
""
)ColumnAliaser.withPattern((2 to 3).toSet, "prefix.")
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def
withPattern1(prefix: String, suffix: String = "")(positions: Int*): ColumnAliaser
- prefix
the prefix to be prepended to the aliases of the matching columns
- suffix
the suffix to be appended to the aliases (default:
""
)- positions
the column positions (>= 1); duplicate are merged
ColumnAliaser.withPattern((2 to 3).toSet, "prefix.")
- object empty extends ColumnAliaser