Add post processing logic for aggregation query.

[penghuo]

Issue #, if available:

Description of changes:

Problem Statement

Support expression over aggregation function is an important feature has been request a lot by customer. The current SQL engine try to translate all the expression to painless script if possible which limit the implementation. This PR works on add the post processing logic into the current framework for aggregation query which is the first step to enable the expression over aggregation function support.

Change Notes

1. Construct the QueryPlan for aggregation query if possible.
2. Add the SQLExpr to PhysicalOperator convert.
3. Add the ExprValue and Expression(SUM, SUB, LOG)
4. Change the JDBC and CSF Formatter.

Integration Test changes

1. CsvFormatResponseIT, fix the incorrect column assertion
2. PrettyFormatResponseIT, fix the incorrect column assertion
3. SQLFunctionsIT, fix the incorrect column assertion

Todo

The next PR will address the following pieces

1. More Expression support
2. Integration Test cases for expression over aggregation function
   By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[dai-chen]

Thanks for adding this important feature!

[chloe-zh]

Does it work if the number of parameters in basic arithmetic expressions is indeterminate? eg. max(field_1) + max(field_2) + max(field_3) + ...

[penghuo]

Yes, it will be compile as add(max(field_1),add(max(field_2),max(field_3)).

[chloe-zh]

LGTM, thanks!