apache / apache/beam

Implementing getTableStatistics for HCatalogTable

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dsl hcatalog io java new feature P3 sql
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Description

Currently HCatalogTable returns Unknown statistics which can be bad for the query optimizer. We need to estimate the row count 

Imported from Jira [BEAM-7900](https://issues.apache.org/jira/browse/BEAM-7900). Original Jira may contain additional context.
Reported by: riazela.

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