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Returns the leftmost len(len can be string type) characters from the string str, if len is less or equal than 0 the result is an empty string.
For the corresponding Databricks SQL function, see left function.
Syntax
from pyspark.databricks.sql import functions as dbf
dbf.left(str=<str>, len=<len>)
Parameters
| Parameter | Type | Description |
|---|---|---|
str |
pyspark.sql.Column or str |
Input column or strings. |
len |
pyspark.sql.Column or str |
Input column or strings, the leftmost len. Examples -------- >>> df = spark.createDataFrame([("Spark SQL", 3,)], ['a', 'b']) >>> df.select(left(df.a, df.b).alias('r')).collect() [Row(r='Spa')] |
Examples
df = spark.createDataFrame([("Spark SQL", 3,)], ['a', 'b'])
df.select(left(df.a, df.b).alias('r')).collect()