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Improve error message when filtering on non-existant partition columns #1218

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wjones127 opened this issue Mar 12, 2023 · 0 comments · Fixed by #1221
Closed

Improve error message when filtering on non-existant partition columns #1218

wjones127 opened this issue Mar 12, 2023 · 0 comments · Fixed by #1221
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binding/python Issues for the Python package binding/rust Issues for the Rust crate enhancement New feature or request good first issue Good for newcomers

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@wjones127
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wjones127 commented Mar 12, 2023 •
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Description

When I tried filtering with the partition filters on date columns, I got the error:

When I tried filtering with partition filters on a table that didn't have any partition columns, I got the error:

Invalid partition filter found: [PartitionFilter { key: "observation_date", value: Equal("2023-01-03") }].

We should improve this error message to say something like:

Tried to filter partitions on column "observation_date", but that isn't one of the partition columns. This table has no partition columns.
@wjones127 wjones127 added enhancement New feature or request good first issue Good for newcomers binding/python Issues for the Python package binding/rust Issues for the Rust crate labels Mar 12, 2023
@wjones127 wjones127 changed the title Support partition filters on date columns Improve error message when filtering on non-existant partition columns Mar 12, 2023
@marijncv marijncv mentioned this issue Mar 12, 2023
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wjones127 pushed a commit that referenced this issue Mar 24, 2023
@marijncv
improve err msg on use of non-partitioned column (#1221)
4e0b74e 
# Description
Updates the error message when trying to use a partition filter with a
column that is not partitioned.

Code to trigger the error (adapted from #1219):
```python
from datetime import date

import numpy as np
import numpy.random
import pandas as pd
from deltalake import DeltaTable, write_deltalake

nrows = 9
data = pd.DataFrame(
    {
        "year": np.repeat(2023, nrows),
        "month": np.repeat([1, 2, 3], nrows / 3),
        "values": numpy.random.normal(size=nrows),
    }
)
table_path = "tables/monthly"
write_deltalake(
    table_path,
    data,
    partition_by=["year", "month"],
    mode="overwrite",
)

nrows = 4
new_data = pd.DataFrame(
    {
        "year": np.repeat(2023, nrows),
        "month": np.repeat([4], nrows),
        "values": numpy.random.normal(size=nrows) + 10,
    }
)

write_deltalake(
    table_path,
    new_data,
    mode="overwrite",
    partition_filters=[("values", "=", "1")],
)
DeltaTable(table_path).to_pandas()
```

# Related Issue(s)
closes #1218 

# Documentation

<!---
Share links to useful documentation
--->

---------

Signed-off-by: Marijn Valk <[email protected]>
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improve err msg on use of non-partitioned column marijncv/delta-rs
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