Test: Bind delta merge storage with executor ut

[ywqzzy]

What problem does this PR solve?

Issue Number: ref #4609

Problem Summary:
We want to use DeltaMergeStorage to run the query in ut framework.
Then we can test the whole query process in single node(not including mpp with multiple nodes, we assume that data are stored in one node).
It will be helpful for features that change both storage code and compute code. Eg: late materialization and pipeline model.
Maybe RSFilter can use ut framework too.
Here is one simple case:

context.addMockDeltaMerge({"test_db", "t0"},
                                  {{"col0", TiDB::TP::TypeLongLong}},
                                  {{toVec<Int64>("col0", {0, 1, 2, 3, 4, 5, 6, 7})}});

auto request = context
                       .scan("test_db", "t0")
                       .build(context);
executeAndAssertColumnsEqual(
        request,
        {{toNullableVec<Int64>("col0", {0, 1, 2, 3, 4, 5, 6, 7})}});

What is changed and how it works?

1. We use MockStorage to hold DeltaMergeStorage.

    std::unordered_map<String, Int64> name_to_id_map_for_delta_merge; /// <table_name, table_id>
    std::unordered_map<Int64, MockColumnInfoVec> table_schema_for_delta_merge; /// <table_id, columnInfo>
    std::unordered_map<Int64, std::shared_ptr<StorageDeltaMerge>> storage_delta_merge_map; // <table_id, StorageDeltaMerge>
    std::unordered_map<String, TableInfo> table_infos_for_delta_merge; /// <table_name, table_info>
    std::unordered_map<Int64, NamesAndTypes> names_and_types_map_for_delta_merge; /// <table_id, NamesAndTypes>

2. When writing the test, we must call

MockDAGRequestContext::addMockDeltaMerge(const MockTableName & name, const MockColumnInfoVec & columnInfos, ColumnsWithTypeAndName columns);

to define the table schema and insert table columns.
3. addMockDeltaMerge will call

addMockDeltaMergeSchema(db, table, columnInfos);
addMockDeltaMergeData(db, table, columns);

to add schema and data into corresponding DeltaMergeStorage
4. When running a test query, planner will choose to use the DeltaMergeStorage to generate source streams.
5. BTW, I have moved a bunch of code like

using ColMyDateTimeNullableType = std::optional<typename TypeTraits<MyDateTime>::FieldType>;
using ColDecimalNullableType = std::optional<typename TypeTraits<Decimal32>::FieldType>;

into dbms/src/TestUtils/ExecutorTestUtils.h to make the test code cleaner.

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

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• Lloyd-Pottiger
• SeaRise

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[ywqzzy]

/run-all-tests

[ywqzzy]

/run-all-tests

[ywqzzy]

/run-all-tests

[SeaRise]

Others lgtm

[SeaRise]

add some assert for function xxxFromDeltaMerge

[SeaRise]

/cc @JaySon-Huang

[SeaRise]

/run-unit-test

[ywqzzy]

/run-unit-tests

[ywqzzy]

/run-unit-tests

[ywqzzy]

/run-all-tests

[ywqzzy]

/run-all-tests

[ywqzzy]

/merge

[ti-chi-bot]

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/run-all-tests

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This pull request has been accepted and is ready to merge.

Commit hash: b67b85a