[nickvanw]

Summary

• decode Vitess BIT raw bytes as unsigned big-endian values instead of signed varints
• return clear errors when BIT values cannot fit the signed Fivetran LONG representation
• add focused converter coverage for one-byte, multibyte, high-bit, and overflow cases

Evidence

Vitess exposes MySQL BIT columns as querypb.Type_BIT and VStream row values carry the raw bit bytes. In upstream Vitess, BIT is not an integral sqltypes.Value, so this connector takes the raw-byte branch. Go binary.Varint decodes a different signed varint format, causing values like 0x01, 0x80, and 0xff to serialize incorrectly or fail.

Validation

• GOCACHE=/tmp/fivetran-bugbash.qcjUz1/gocache go test ./cmd/internal/server/handlers
• git diff --check