KnowForgeBolt Backend Generator Function Support
qianmoQ· 更新于 2026-10-02· 阅读 3 分钟· 0 次阅读登录后可跨设备保存划线和私人笔记登录
Spark Generator Functions Support Status in Bolt
- Date: 2026-01-08
- Spark Version: 3.5
Support Matrix
| Spark Functions | Bolt Plan/Operator | Status (S/NS) | Notes/Restrictions |
|---|---|---|---|
explode | GeneratorNode / GeneratorExplode | S | Supports arrays (emits one column) and maps (emits key and value columns). |
explode_outer | GeneratorNode / GeneratorExplode | S | Handles NULL or empty inputs by producing NULL in the output columns, controlled by the isOuter flag. |
posexplode | GeneratorNode / GeneratorExplode | S | Generates an additional zero-based integer index column, controlled by the withOrdinality flag. |
posexplode_outer | GeneratorNode / GeneratorExplode | S | Combines outer semantics with positional indexing (isOuter + withOrdinality flags). |
inline | N/A | NS | No dedicated generator or operator was found in the codebase. The function name exists in metadata lists but lacks an execution implementation. |
inline_outer | N/A | NS | Same as inline; no specific implementation was found. |
stack | N/A | NS | The semantics of ExpandNode match Spark’s stack function, which transforms one row into multiple. |
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