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#

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import datafusion

import pyarrow as pa

from datafusion import col

# create a context

ctx = datafusion.SessionContext()

# create a RecordBatch and a new DataFrame from it

batch = pa.RecordBatch.from_arrays(

[pa.array([1, 2, 3]), pa.array([4, 5, 6])],

names=["a", "b"],

)

df = ctx.create_dataframe([[batch]])

# create a new statement

df = df.select(

col("a") + col("b"),

col("a") - col("b"),

)

# execute and collect the first (and only) batch

result = df.collect()[0]

assert result.column(0) == pa.array([5, 7, 9])

assert result.column(1) == pa.array([-3, -3, -3])