[CALCITE-972] Decimal data sent by Avatica cannot be interpreted by some clients

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: 1.5.0
• Component/s: avatica
• Labels: decimal double wireprotocol
• External issue ID: PHOENIX-2324
• Assignee: Unassigned
• Reporter: Kevin Liew
• Created: 16/Nov/15 20:42
• Updated: 22/Feb/19 01:22

Description

JSON specifies a 'number' data type which does not differentiate between integer and floating-point values. The encoding for JSON numbers is implementation-specific. Libraries such as RapidJSON can treat all non-integer values as 'double' while still being compliant with JSON specifications. As a result, decimal values sent by Phoenix will lose precision on the client side.

Decimal data should be sent as a string. If it is sent as a number, we cannot be expect that all JSON-spec compliant library will handle it properly.

ie. Phoenix sends a decimal as a JSON number, but Rapidjson can only extract JSON numbers as integer or double because the C++ language does not have native decimal support.

Issue Links

• relates to: CALCITE-1103 Decimal data serialized as Double in Protocol Buffer API