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[SPARK-28411][PYTHON][SQL] InsertInto with overwrite is not honored #25175

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[SPARK-28411][PYTHON][SQL] InsertInto with overwrite is not honored #25175

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566fc84
[SPARK-28411][PYTHON][SQL] InsertInto with overwrite is not honored
huaxingao Jul 16, 2019
379eba6
address comments
huaxingao Jul 17, 2019
8f3074f
fix the mistake
huaxingao Jul 17, 2019
9b167e1
update mode if overwrite is not None
huaxingao Jul 17, 2019
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6 changes: 4 additions & 2 deletions python/pyspark/sql/readwriter.py
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Original file line number Diff line number Diff line change
Expand Up @@ -757,15 +757,17 @@ def save(self, path=None, format=None, mode=None, partitionBy=None, **options):
self._jwrite.save(path)

@since(1.4)
def insertInto(self, tableName, overwrite=False):
def insertInto(self, tableName, overwrite=None):
"""Inserts the content of the :class:`DataFrame` to the specified table.

It requires that the schema of the class:`DataFrame` is the same as the
schema of the table.

Optionally overwriting any existing data.
"""
self._jwrite.mode("overwrite" if overwrite else "append").insertInto(tableName)
if overwrite is not None:
self.mode("overwrite" if overwrite else "append")
self._jwrite.insertInto(tableName)

@since(1.4)
def saveAsTable(self, name, format=None, mode=None, partitionBy=None, **options):
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21 changes: 21 additions & 0 deletions python/pyspark/sql/tests/test_readwriter.py
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Expand Up @@ -141,6 +141,27 @@ def count_bucketed_cols(names, table="pyspark_bucket"):
.mode("overwrite").saveAsTable("pyspark_bucket"))
self.assertSetEqual(set(data), set(self.spark.table("pyspark_bucket").collect()))

def test_insert_into(self):
df = self.spark.createDataFrame([("a", 1), ("b", 2)], ["C1", "C2"])
with self.table("test_table"):
df.write.saveAsTable("test_table")
self.assertEqual(2, self.spark.sql("select * from test_table").count())

df.write.insertInto("test_table")
self.assertEqual(4, self.spark.sql("select * from test_table").count())

df.write.mode("overwrite").insertInto("test_table")
self.assertEqual(2, self.spark.sql("select * from test_table").count())

df.write.insertInto("test_table", True)
self.assertEqual(2, self.spark.sql("select * from test_table").count())

df.write.insertInto("test_table", False)
self.assertEqual(4, self.spark.sql("select * from test_table").count())

df.write.mode("overwrite").insertInto("test_table", False)
self.assertEqual(6, self.spark.sql("select * from test_table").count())


if __name__ == "__main__":
import unittest
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