feat: arrow in, arrow out

[fanyang01]

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Copilot reviewed 6 out of 11 changed files in this pull request and generated no suggestions.

Files not reviewed (5)

• pgtest/psql/copy/arrow.sql: Language not supported
• pgserver/arrowloader.go: Evaluated as low risk
• pgserver/connection_handler.go: Evaluated as low risk
• pgserver/copy_test.go: Evaluated as low risk
• pgserver/dataloader.go: Evaluated as low risk

Comments skipped due to low confidence (2)

pgserver/copy.go:1

• [nitpick] The function name ParseCopyOptions could be more descriptive, such as ParseCopyFormatOptions, to indicate that it parses format-specific options.

package pgserver

pgserver/copy.go:78

• [nitpick] The type name OptionValueType could be more descriptive, such as CopyOptionValueType, to indicate that it is related to COPY options.

type OptionValueType uint8

[VWagen1989]

LGTM! It's really an amazing feature! With this MyDuck and propagate data outside and load data inside in pure columnar format! Congrats, Great job!