[HBASE-27060] Allow sharing connections between AggregationClient instances - ASF JIRA

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Release Note:

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Added a new no-arg constructor for AggregationClient which allows lightweight usage of just the methods accepting a Table. Also added a new constructor which takes a Connection, allowing the user to pass their own externally managed connection which will be used when methods accepting a TableName are used.

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Added a new no-arg constructor for AggregationClient which allows lightweight usage of just the methods accepting a Table. Also added a new constructor which takes a Connection, allowing the user to pass their own externally managed connection which will be used when methods accepting a TableName are used.

AggregationClient only has a single constructor which takes a Configuration. The constructor uses the Configuration to create a Connection.

However, some of the AggregationClient methods take a Table argument. In those cases it doesn't use the created Connection at all.

We should add another constructor which does not create a Connection so that people can use AggregationClient with externally managed Connection.

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GitHub Pull Request #4566