[SPARK-37207][SQL][PYTHON] Add isEmpty method for the Python DataFram…

…e API

### What changes were proposed in this pull request?
Add isEmpty method for the Python DataFrame API

### Why are the changes needed?
Python Scala compatibility

### Does this PR introduce _any_ user-facing change?
Is Empty method would in in data frame api

### How was this patch tested?
Doctests for isEmpty

Closes #34484 from dhirennavani/master.

Authored-by: Dhiren Navani <navanidhiren@gmail.com>
Signed-off-by: Sean Owen <srowen@gmail.com>

python/docs/source/reference/pyspark.sql.rst

@@ -171,6 +171,7 @@ DataFrame APIs
     DataFrame.inputFiles
     DataFrame.intersect
     DataFrame.intersectAll
+    DataFrame.isEmpty
     DataFrame.isLocal
     DataFrame.isStreaming
     DataFrame.join

python/pyspark/sql/dataframe.py

@@ -473,6 +473,22 @@ def isStreaming(self) -> bool:
         """
         return self._jdf.isStreaming()
 
+    def isEmpty(self) -> bool:
+        """Returns ``True`` if this :class:`DataFrame` is empty.
+
+        .. versionadded:: 3.3.0
+
+        Examples
+        --------
+        >>> df_empty = spark.createDataFrame([], 'a STRING')
+        >>> df_non_empty = spark.createDataFrame([("a")], 'STRING')
+        >>> df_empty.isEmpty()
+        True
+        >>> df_non_empty.isEmpty()
+        False
+        """
+        return self._jdf.isEmpty()
+
     def show(self, n: int = 20, truncate: Union[bool, int] = True, vertical: bool = False) -> None:
         """Prints the first ``n`` rows to the console.