Fix/issue 4231 bytea corruption

[ljluestc]

fix(contrib/drivers/pgsql): preserve bytea data containing 0x5D

Bug Description

Fixes issue #4231 where PostgreSQL bytea fields containing the byte 0x5D (ASCII ]) were being forcibly converted to 0x7D (ASCII }), causing data corruption and image parsing failures.

Root Cause

The ConvertValueForField function in contrib/drivers/pgsql/pgsql_convert.go was applying array syntax conversion ([ → {, ] → }) to all slice types, including binary data intended for bytea fields. This conversion is only appropriate for PostgreSQL array types, not binary data.

Changes Made

• Modified: contrib/drivers/pgsql/pgsql_convert.go
  • Added check for []byte with bytea field type before applying array conversion
  • Preserves binary data integrity for bytea fields
• Added: contrib/drivers/pgsql/pgsql_z_unit_issue_4231_test.go
  • Regression test that inserts and retrieves binary data containing 0x5D
  • Verifies data integrity is maintained throughout the round-trip

Integration test (requires PostgreSQL)

cd contrib/drivers/pgsql
go test -v -run Test_Issue4231