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Returns a new DataFrame containing union of rows in this and another DataFrame.
Syntax
unionByName(other: "DataFrame", allowMissingColumns: bool = False)
Parameters
| Parameter | Type | Description |
|---|---|---|
other |
DataFrame | Another DataFrame that needs to be combined. |
allowMissingColumns |
bool, optional, default False | Specify whether to allow missing columns. |
Returns
DataFrame: A new DataFrame containing the combined rows with corresponding columns of the two given DataFrames.
Notes
This method performs a union operation on both input DataFrames, resolving columns by name (rather than position). When allowMissingColumns is True, missing columns will be filled with null.
Examples
df1 = spark.createDataFrame([[1, 2, 3]], ["col0", "col1", "col2"])
df2 = spark.createDataFrame([[4, 5, 6]], ["col1", "col2", "col0"])
df1.unionByName(df2).show()
# +----+----+----+
# |col0|col1|col2|
# +----+----+----+
# | 1| 2| 3|
# | 6| 4| 5|
# +----+----+----+
df1 = spark.createDataFrame([[1, 2, 3]], ["col0", "col1", "col2"])
df2 = spark.createDataFrame([[4, 5, 6]], ["col1", "col2", "col3"])
df1.unionByName(df2, allowMissingColumns=True).show()
# +----+----+----+----+
# |col0|col1|col2|col3|
# +----+----+----+----+
# | 1| 2| 3|NULL|
# |NULL| 4| 5| 6|
# +----+----+----+----+