大量小文件对查询性能有很大的影响，因为NameNode要保存大量的HDFS文件元数据，一次性查询很多分区或者文件...
PySpark expr() is a SQL function to execute SQL-like expressions and to use an existing DataFrame column value as an expression argument to Pyspark built-in functions. Most of the commonly used SQL functions are either part of the PySpark Column class or built-in pyspark.sql.functions API, ...
New issue [SPARK-50126][PYTHON][CONNECT][3.5] PySpark expr() (expression) SQL Function returns None in Spark Connect #49755 Closed the-sakthi wants to merge 1 commit into apache:branch-3.5 from the-sakthi:SPARK-50126+15 −1
_from_call(_method, "method", returns_scalar=False) # if not predicate-based (e.g. unique, which uses array function `F.array_distinct`) def method(self) -> Self: def _method(_input: Column) -> Column: from pyspark.sql import functions as F # noqa: N812 return F.explode(<array...