Optimize memory usage #6
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Add configurable metadata Add max_lines in insert
Add configurable metadata and record hash column name
Add configurable hash method
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Currently, XML file is parsed in memory, then document tree is extracted, then hash are computed, then the data is extracted into a flat data model. This PR proposes to switch to iterative event based parsing as a default in order to optimize memory use, while keeping also the original approach, which can be faster even if it uses more memory.