refreshByPath

Invalide et actualise toutes les données mises en cache (et les métadonnées associées) pour n’importe quel DataFrame qui contient le chemin de source de données donné.

Syntaxe

refreshByPath(path: str)

Paramètres

Exemples

# 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")