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Convert parquet timestamps directly to usable iso time format #40

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Merged
merged 4 commits into from
Nov 14, 2025
Merged

Convert parquet timestamps directly to usable iso time format #40

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2a750db
fix: fixed duplicated removal of first index / header
Nov 14, 2025
05e34c5
convert parquet timestamps directly to usable iso timeformat instead …
Nov 14, 2025
c6800fb
Merge remote-tracking branch 'origin/main' into parquet-iso-timeformat
Nov 14, 2025
5beb58d
fix ruff linter
Nov 14, 2025
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15 changes: 14 additions & 1 deletion src/Tables/utils/file_reader.py
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Original file line number Diff line number Diff line change
Expand Up @@ -230,7 +230,20 @@ def read_excel(self, path: Path, **kwargs) -> DataFrame:

def read_parquet(self, path: Path) -> DataFrame:
""" """
return pd.read_parquet(path)
df: DataFrame = pd.read_parquet(path)

# try to transform to ISO timeformat -> if transformation fails, just return original parquet dataframe
try:
return self._parquet_transform_to_iso_timeformat(df)
except Exception:
return pd.read_parquet(path)

def _parquet_transform_to_iso_timeformat(self, df: DataFrame) -> DataFrame:
ts_cols = df.select_dtypes(include=["datetime64[ns]", "datetime64[ns, UTC]"]).columns
for col in ts_cols:
df[col] = df[col].dt.strftime("%Y-%m-%dT%H:%M:%S.%fZ")
df[col] = df[col].str[:-3] + "Z"
return df

def read_table_file(self, path: Path) -> DataFrame:
"""
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7 changes: 7 additions & 0 deletions tests/atest/test_reader.robot
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Expand Up @@ -206,6 +206,13 @@ Read Parquet File - Without Header
${result} = BuiltIn.Evaluate "_time" not in "${content}"
BuiltIn.Should Be True ${result}

Open Table - Parquet
Tables.Configure Ignore Header False
${alias} = Tables.Open Table ${CURDIR}${/}testdata${/}example_03.parquet
@{data} = Tables.Get Table
Should Contain ${data}[1][0] 2025
Tables.Count Table ${alias} Rows == ${1001}

Get Table Cell - Parquet
Tables.Configure Ignore Header False
Tables.Open Table ${CURDIR}${/}testdata${/}example_03.parquet
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