HyukjinKwon commented on code in PR #43360:
URL: https://github.com/apache/spark/pull/43360#discussion_r1365227126
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python/pyspark/sql/readwriter.py:
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@@ -69,20 +83,26 @@ class DataFrameReader(OptionUtils):
def __init__(self, spark: "SparkSession"):
self._jreader = spark._jsparkSession.read()
self._spark = spark
+ self._format: Optional[Union[str, Type[DataSource]]] = None
+ self._schema: Optional[Union[str, StructType]] = None
+ self._options: Dict[str, "OptionalPrimitiveType"] = dict()
def _df(self, jdf: JavaObject) -> "DataFrame":
from pyspark.sql.dataframe import DataFrame
return DataFrame(jdf, self._spark)
- def format(self, source: str) -> "DataFrameReader":
+ def format(self, source: Union[str, Type[DataSource]]) ->
"DataFrameReader":
Review Comment:
1. Create a INI file either under Spark conf directory, or current working
directory (maybe optionally define the location via a static configuration).
2. Read it in `DataSource.lookupDataSource`, and loads the class. We will
likely need a wrapper class that inherits Scala Datasource classes.
3. The wrapper Datasource invokes the Python interface to read/write, etc.
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