Delta Live Tables Quality check for distinct Values

[Zii]

Hi All,

I have been having an issue identifying how to do a uniqueness check for the quality check. Below is an example.

@dlt.expect("origin_not_dup", "origin is distinct from origin")
def harmonized_data():
    df=dlt.read("raw_data")
    for col in df.columns:
        df = df.withColumnRenamed(col, col.lower())
    df=df.select("car", "mpg", "origin")
    return df

 options that i tried.

• @dlt.expect("origin_not_dup", "origin is distinct from origin")
• @dlt.expect("origin_not_dup", "origin is distinct")
• @dlt.expect("origin_not_dup", "origin is unique")

they all end up with an error.

Since Delta live table is still relatively new, i wasn't able find how to do so. Any guidance is appreciated.

Thanks in advance.