Better estimation for ColumnLowCardinality::Reserve and ColumnString::Reserve #346
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…:Reserve ColumnLowCardinality assumes that not all items are unique, hence dictionary column can be reserved for smaller capacity; ColumnString now allows to set average value size estimation in constructor or on existing instance. If estimation is close to real average value size, then memory is pre-allocations are close to optimum.
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Closing to re-open and to re-trigger CI/CD |
…tests - Added validation for ColumnString::EstimatedValueSize value in ColumnString - Minor refactoring of block allocation in ColumnString - Moved test code for ColumnString and ColumnLowCardinality to separate files, - Added more test cases
Andded PrettyPrintByteSize + some tests
also removed commented out code
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ColumnLowCardinality assumes that not all items are unique, hence dictionary column can be reserved for smaller capacity.
ColumnString now allows to set average value size estimation in constructor or on existing instance.
If estimation is close to real average value size, then memory pre-allocations are close to optimum.
Added method
MemoryUsagethat provides insight on the amount of RAM used by column instance.