pgAdmin 4 commit: Support EXPLAIN on Greenplum. Fixes #3097

Support EXPLAIN on Greenplum. Fixes #3097

- Extract SQLEditor.execute and SQLEditor._poll into their own files and add test around them
- Extract SQLEditor backend functions that start executing query to their own files and add tests around it
- Move the Explain SQL from the front-end and now pass the Explain plan parameters as a JSON object in the start query call.
- Extract the compile_template_name into a function that can be used by the different places that try to select the version of the template and the server type

Branch
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master

Details
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https://git.postgresql.org/gitweb?p=pgadmin4.git;a=commitdiff;h=e16a95275336529a734bf0066889e39cc8ef0662
Author: Joao Pedro De Almeida Pereira <jdealmeidapereira(at)pivotal(dot)io>

Modified Files
--------------
.../databases/schemas/tables/tests/test_utils.py | 0
web/pgadmin/static/js/sqleditor/execute_query.js | 287 ++++
.../js/sqleditor/is_new_transaction_required.js | 14 +
.../static/js/sqleditor/query_tool_actions.js | 33 +-
web/pgadmin/tools/sqleditor/__init__.py | 396 +----
web/pgadmin/tools/sqleditor/static/js/sqleditor.js | 227 +--
.../sqleditor/sql/10_plus/explain_plan.sql | 23 +
.../sqleditor/sql/9.2_plus/explain_plan.sql | 20 +
.../sqleditor/sql/default/explain_plan.sql | 17 +
.../sqleditor/sql/gpdb_5.0_plus/explain_plan.sql | 5 +
web/pgadmin/tools/sqleditor/tests/__init__.py | 8 +
.../sqleditor/tests/test_explain_plan_templates.py | 152 ++
.../test_extract_sql_from_network_parameters.py | 59 +
.../tools/sqleditor/tests/test_start_query_tool.py | 38 +
web/pgadmin/tools/sqleditor/utils/__init__.py | 14 +
.../sqleditor/utils/apply_explain_plan_wrapper.py | 24 +
.../tools/sqleditor/utils/constant_definition.py | 32 +
.../tools/sqleditor/utils/is_begin_required.py | 169 ++
.../tools/sqleditor/utils/start_running_query.py | 172 ++
.../tools/sqleditor/utils/tests/__init__.py | 8 +
.../utils/tests/test_apply_explain_plan_wrapper.py | 121 ++
.../utils/tests/test_start_running_query.py | 445 +++++
.../utils/update_session_grid_transaction.py | 18 +
web/pgadmin/utils/compile_template_name.py | 17 +
.../utils/tests/test_compile_template_name.py | 34 +
web/pgadmin/utils/versioned_template_loader.py | 2 +-
web/regression/javascript/fake_endpoints.js | 6 +-
.../javascript/sqleditor/execute_query_spec.js | 1702 ++++++++++++++++++++
.../sqleditor/is_new_transaction_required_spec.js | 65 +
.../sqleditor/query_tool_actions_spec.js | 141 +-
30 files changed, 3670 insertions(+), 579 deletions(-)