Update to Substrait v0.88.0

[nielspardon]

Release notes

0.88.0 (2026-04-12)

⚠ BREAKING CHANGES

• extensions: deprecates the function signatures for std_dev and
  variance using function options in favor of the versions using enum
  arguments

• dialect: explicitly defines the maximum length of FIXEDBINARY
  in the documentation which was already existent in the protobuf
  specification due to the use of int32 for the length argument

• adds max_length for FIXED_BINARY, VARCHAR, FIXED_CHAR to the
  dialect schema
• adds max_precision and max_scale for DECIMAL to the dialect
  schema
• updated the documentation to mention the maximum length for
  FIXEDBINARY which is given by the use of int32 for the length
  field in the
  proto

• removes the deprecated time, timestamp and
  timestamp_tz types from:

  • proto files
  • dialect schema
  • extension yamls
  • ANTLR grammar
  • test cases
  • coverage python code
  • documentation

• removed Aggregate.Grouping.grouping_expressions field

Features

• add TopNRel physical operator with WITH TIES support (#1009) (6cf8ff3)
• dialect: support max length, scale, precision for parameterized types (#1030) (edaed64)
• extensions: deprecate std_dev and variance using function options (#1019) (fc6ab3c)
• remove deprecated time, timestamp and timestamp_tz types (#994) (87d73b6), closes #980
• removed AggregateRel.Grouping.grouping_expressions (#1002) (c82f39a)
• tests: use URN instead of path for extension references (#1028) (dd25f77)

See https://github.com/substrait-io/substrait/releases/tag/v0.88.0