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Implement all CSV reader options #1361
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| # Licensed to the Apache Software Foundation (ASF) under one | ||
| # or more contributor license agreements. See the NOTICE file | ||
| # distributed with this work for additional information | ||
| # regarding copyright ownership. The ASF licenses this file | ||
| # to you under the Apache License, Version 2.0 (the | ||
| # "License"); you may not use this file except in compliance | ||
| # with the License. You may obtain a copy of the License at | ||
| # | ||
| # http://www.apache.org/licenses/LICENSE-2.0 | ||
| # | ||
| # Unless required by applicable law or agreed to in writing, | ||
| # software distributed under the License is distributed on an | ||
| # "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY | ||
| # KIND, either express or implied. See the License for the | ||
| # specific language governing permissions and limitations | ||
| # under the License. | ||
|
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| """Example demonstrating CsvReadOptions usage.""" | ||
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| from datafusion import CsvReadOptions, SessionContext | ||
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| # Create a SessionContext | ||
| ctx = SessionContext() | ||
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| # Example 1: Using CsvReadOptions with default values | ||
| print("Example 1: Default CsvReadOptions") | ||
| options = CsvReadOptions() | ||
| df = ctx.read_csv("data.csv", options=options) | ||
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| # Example 2: Using CsvReadOptions with custom parameters | ||
| print("\nExample 2: Custom CsvReadOptions") | ||
| options = CsvReadOptions( | ||
| has_header=True, | ||
| delimiter=",", | ||
| quote='"', | ||
| schema_infer_max_records=1000, | ||
| file_extension=".csv", | ||
| ) | ||
| df = ctx.read_csv("data.csv", options=options) | ||
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| # Example 3: Using the builder pattern (recommended for readability) | ||
| print("\nExample 3: Builder pattern") | ||
| options = ( | ||
| CsvReadOptions() | ||
| .with_has_header(True) # noqa: FBT003 | ||
| .with_delimiter("|") | ||
| .with_quote("'") | ||
| .with_schema_infer_max_records(500) | ||
| .with_truncated_rows(False) # noqa: FBT003 | ||
| .with_newlines_in_values(True) # noqa: FBT003 | ||
| ) | ||
| df = ctx.read_csv("data.csv", options=options) | ||
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| # Example 4: Advanced options | ||
| print("\nExample 4: Advanced options") | ||
| options = ( | ||
| CsvReadOptions() | ||
| .with_has_header(True) # noqa: FBT003 | ||
| .with_delimiter(",") | ||
| .with_comment("#") # Skip lines starting with # | ||
| .with_escape("\\") # Escape character | ||
| .with_null_regex(r"^(null|NULL|N/A)$") # Treat these as NULL | ||
| .with_truncated_rows(True) # noqa: FBT003 | ||
| .with_file_compression_type("gzip") # Read gzipped CSV | ||
| .with_file_extension(".gz") | ||
| ) | ||
| df = ctx.read_csv("data.csv.gz", options=options) | ||
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| # Example 5: Register CSV table with options | ||
| print("\nExample 5: Register CSV table") | ||
| options = CsvReadOptions().with_has_header(True).with_delimiter(",") # noqa: FBT003 | ||
| ctx.register_csv("my_table", "data.csv", options=options) | ||
| df = ctx.sql("SELECT * FROM my_table") | ||
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| # Example 6: Backward compatibility (without options) | ||
| print("\nExample 6: Backward compatibility") | ||
| # Still works the old way! | ||
| df = ctx.read_csv("data.csv", has_header=True, delimiter=",") | ||
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| print("\nAll examples completed!") | ||
| print("\nFor all available options, see the CsvReadOptions documentation:") | ||
| print(" - has_header: bool") | ||
| print(" - delimiter: str") | ||
| print(" - quote: str") | ||
| print(" - terminator: str | None") | ||
| print(" - escape: str | None") | ||
| print(" - comment: str | None") | ||
| print(" - newlines_in_values: bool") | ||
| print(" - schema: pa.Schema | None") | ||
| print(" - schema_infer_max_records: int") | ||
| print(" - file_extension: str") | ||
| print(" - table_partition_cols: list[tuple[str, pa.DataType]]") | ||
| print(" - file_compression_type: str") | ||
| print(" - file_sort_order: list[list[SortExpr]]") | ||
| print(" - null_regex: str | None") | ||
| print(" - truncated_rows: bool") |
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I think it would be nice to have a link to docs.rs or similar that points to all available options for
CsvReadOptions.There was a problem hiding this comment.
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Added