first

First (Col)

Returns the first column from this that adheres to the optional given condition. If no column adheres to the given condition, NoSuchElementException is thrown.

This function operates solely on columns at the top-level.

NOTE: For column groups, first is named firstCol instead to avoid confusion.

For more information: See First (Col), Last (Col), Single (Col) on the documentation website.

Check out: Grammar

Examples:

df.select{ first{ it.name().startsWith("order") } }

df.select{ "myColumnGroup".firstCol{ it.name().startsWith("year") } }

Examples for this overload:

df.select{ colsOf<String>().first{ it.name().startsWith("year") } }

df.select{ colsOf<Int>().first() }

Parameters

See also

Throws

First (Col)

Returns the first column from this that adheres to the optional given condition. If no column adheres to the given condition, NoSuchElementException is thrown.

This function operates solely on columns at the top-level.

NOTE: For column groups, first is named firstCol instead to avoid confusion.

For more information: See First (Col), Last (Col), Single (Col) on the documentation website.

Check out: Grammar

Examples:

df.select{ first{ it.name().startsWith("order") } }

df.select{ "myColumnGroup".firstCol{ it.name().startsWith("year") } }

Examples for this overload:

df.select{ first{ it.name().startsWith("year") } }

Parameters

See also

Throws