branch-4.1: [refactor](be) Remove io_helper helper indirection from BE cast paths (#62179)

[zclllyybb]

pick #62179

[hello-stephen]

Thank you for your contribution to Apache Doris.
Don't know what should be done next? See How to process your PR.

Please clearly describe your PR:

1. What problem was fixed (it's best to include specific error reporting information). How it was fixed.
2. Which behaviors were modified. What was the previous behavior, what is it now, why was it modified, and what possible impacts might there be.
3. What features were added. Why was this function added?
4. Which code was refactored and why was this part of the code refactored?
5. Which functions were optimized and what is the difference before and after the optimization?

[zclllyybb]

run buildall

[Copilot]

Pull request overview

Refactors Doris BE casting/serde/conversion code to remove the legacy util/io_helper indirection and route parsing/formatting through the canonical CastTo* implementations.

Changes:

• Delete be/src/util/io_helper.{h,cpp} and replace call sites with CastToInt/CastToFloat/CastToDecimal/CastToString and datelike cast implementations.
• Extend cast helpers (notably CastToString 128-bit overloads) and update converters/serdes to use the new entry points.
• Add/extend BE unit tests covering 128-bit string formatting, DecimalV2 cast behavior, datelike conversions, Arrow parsing, and sequence-match time conditions.

Reviewed changes

Copilot reviewed 59 out of 59 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
be/test/exprs/function/cast/cast_to_string_api_test.cpp	Adds tests for new CastToString 128-bit overload behavior.
be/test/exprs/function/cast/cast_to_float_double.cpp	Adds regression test ensuring DecimalV2 preserves scale when casting to float/double.
be/test/exprs/aggregate/vec_sequence_match_test.cpp	Adds tests for time-condition parsing + serialize/deserialize and malformed numeric conditions.
be/test/exec/column_type_convert_test.cpp	Updates largeint formatting to CastToString and adds string→datelike conversion tests.
be/test/core/field_test.cpp	Replaces io_helper include with CastToString.
be/test/core/data_type_serde/data_type_serde_number_test.cpp	Adds Arrow string→(DateV2/DateTimeV2) numeric parsing coverage.
be/test/core/data_type_serde/data_type_serde_decimal_test.cpp	Adds JSON deserialize test to preserve underflow compatibility.
be/test/common/check_overflow.cpp	Switches integer parsing from io_helper helpers to CastToInt.
be/src/util/jsonb_document_cast.h	Routes decimal→decimal casting via CastToDecimal::from_decimal.
be/src/util/io_helper.h	Removes legacy helper header.
be/src/util/io_helper.cpp	Removes legacy helper implementation.
be/src/util/counts.h	Drops io_helper include.
be/src/storage/olap_scan_common.h	Drops io_helper include.
be/src/format/column_type_convert.h	Replaces io_helper parsing with CastTo* APIs and threads CastParameters through string-cast helpers.
be/src/exprs/function/function_json.cpp	Drops io_helper include.
be/src/exprs/function/cast/cast_to_timestamptz.h	Drops io_helper include.
be/src/exprs/function/cast/cast_to_string.h	Adds explicit from_int128/from_uint128 helpers and wires them into from_number.
be/src/exprs/function/cast/cast_to_jsonb.h	Drops io_helper include.
be/src/exprs/function/cast/cast_to_int.h	Uses CastToInt::from_decimal and simplifies decimal overflow/nullability handling.
be/src/exprs/function/cast/cast_to_float.h	Uses CastToFloat::from_decimal for decimal→float/double conversions.
be/src/exprs/function/cast/cast_to_decimal.h	Replaces io_helper decimal parsing and introduces from_decimal wrapper for decimal→decimal casts.
be/src/exprs/function/cast/cast_to_boolean.h	Replaces bool parsing with StringParser::string_to_bool.
be/src/exprs/function/cast/cast_to_basic_number_common.h	Centralizes numeric parsing via StringParser and provides shared int/float cast helpers.
be/src/exprs/function/cast/cast_base.h	Drops io_helper include from cast base utilities.
be/src/exprs/aggregate/moments.h	Drops io_helper include.
be/src/exprs/aggregate/aggregate_function_uniq.h	Drops io_helper include; adds needed column/string headers.
be/src/exprs/aggregate/aggregate_function_topn.h	Drops io_helper include; adds needed column/string headers.
be/src/exprs/aggregate/aggregate_function_sequence_match.h	Replaces integer parsing with StringParser, improves parse-failure reset behavior.
be/src/exprs/aggregate/aggregate_function_rpc.h	Drops io_helper include.
be/src/exprs/aggregate/aggregate_function_product.h	Adjusts debug logging to format int128_t via CastToString.
be/src/exprs/aggregate/aggregate_function_min_max.h	Drops io_helper include; adds decimal column header.
be/src/exprs/aggregate/aggregate_function_java_udaf.h	Drops io_helper include.
be/src/exprs/aggregate/aggregate_function_histogram.h	Drops io_helper include.
be/src/exprs/aggregate/aggregate_function_corr.h	Drops io_helper include; adds standard headers required by implementation.
be/src/exprs/aggregate/aggregate_function_collect.h	Drops io_helper include.
be/src/exprs/aggregate/aggregate_function_bit.h	Drops io_helper include.
be/src/exprs/aggregate/aggregate_function_avg_weighted.h	Drops io_helper include.
be/src/exprs/aggregate/aggregate_function_array_agg.h	Drops io_helper include.
be/src/exec/common/histogram_helpers.hpp	Drops io_helper include.
be/src/exec/common/hash_table/hash_table.h	Drops io_helper include.
be/src/core/field.cpp	Drops io_helper include.
be/src/core/data_type_serde/data_type_serde.h	Updates comment to reference CastToDecimal::from_string.
be/src/core/data_type_serde/data_type_number_serde.cpp	Switches parsing/formatting to CastTo* APIs (incl. IPv6 formatting).
be/src/core/data_type_serde/data_type_ipv6_serde.cpp	Uses CastToIPv6::from_string instead of io_helper reader.
be/src/core/data_type_serde/data_type_ipv4_serde.cpp	Uses CastToIPv4::from_string instead of io_helper reader.
be/src/core/data_type_serde/data_type_decimal_serde.cpp	Replaces decimal JSON parsing with StringParser-based paths.
be/src/core/data_type_serde/data_type_datev2_serde.cpp	Uses CastToDateV2 parsing instead of io_helper reader.
be/src/core/data_type_serde/data_type_datetimev2_serde.cpp	Uses CastToDatetimeV2 parsing instead of io_helper reader.
be/src/core/data_type_serde/data_type_date_or_datetime_serde.cpp	Uses CastToDateOrDatetime parsing and explicit date/datetime post-processing.
be/src/core/data_type/data_type_quantilestate.cpp	Drops io_helper include.
be/src/core/data_type/data_type_number_base.cpp	Uses CastToString for 128-bit number formatting.
be/src/core/data_type/data_type_ipv6.cpp	Drops io_helper include.
be/src/core/data_type/data_type_ipv4.cpp	Drops io_helper include.
be/src/core/data_type/data_type_hll.cpp	Drops io_helper include.
be/src/core/data_type/data_type_decimal.cpp	Drops io_helper include.
be/src/core/data_type/data_type_date_time.cpp	Drops io_helper include.
be/src/core/data_type/data_type_date_or_datetime_v2.cpp	Drops io_helper include.
be/src/core/data_type/data_type_date.cpp	Drops io_helper include.
be/src/core/data_type/data_type_bitmap.cpp	Drops io_helper include.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[zclllyybb]

run buildall

[zclllyybb]

run buildall