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                                            Hao Zou

Huge memory taken for each field when exporting

I will work on it.

ORC-1711: [C++] Introduce a memory block size parameter for writer option

> @luffy-zh Thank you for making the PR. Could you explain why we need `outputStream->getRawInputBufferSize()` to record position? it seems that `flushedSize` and `bufferPosition` were't changed. When we call recordPosition(),...

ORC-1884: [C++] Add a maybe() API to the SearchArgumentBuilder

> Is `maybe()` a shortcut of `literal(TruthValue::YES_NO_NULL)`? Yes, maybe() can be considered a shortcut for literal(TruthValue::YES_NO_NULL). It provides a more concise way to express uncertainty or ambiguity in truth values.