pyspark.sql.Catalog.refreshByPath#

Catalog.refreshByPath(path)[source]#

Invalidates and refreshes all the cached data (and the associated metadata) for any DataFrame that contains the given data source path.

Added in version 2.2.0.

Parameters:

pathstr: the path to refresh the cache.

Examples

The example below caches a table, and then removes the data.

>>> import tempfile
>>> with tempfile.TemporaryDirectory(prefix="refreshByPath") as d:
...     _ = spark.sql("DROP TABLE IF EXISTS tbl1")
...     _ = spark.sql(
...         "CREATE TABLE tbl1 (col STRING) USING TEXT LOCATION '{}'".format(d))
...     _ = spark.sql("INSERT INTO tbl1 SELECT 'abc'")
...     spark.catalog.cacheTable("tbl1")
...     spark.table("tbl1").show()
+---+
|col|
+---+
|abc|
+---+

Because the table is cached, it computes from the cached data as below.

>>> spark.table("tbl1").count()
1

After refreshing the table by path, it shows 0 because the data does not exist anymore.

>>> spark.catalog.refreshByPath(d)
>>> spark.table("tbl1").count()
0

>>> _ = spark.sql("DROP TABLE tbl1")