* Add github action for testing oci8 Oracle.
* Fix CommandTest::testQueryCache.
* Fix tests CommandTest::testBindParamsNonWhere.
* Fix test CommandTest::testInsert.
* Fix test CommanTest::testInsertExpression.
* Fix test CommandTest::testInsertSelectAlias.
* Fix test CommandTest::testBindParamValue.
* Fix tests CommandTest::testBatchInsertDataTypesLocale.
* Fix test CommandTest::testNoTablenameReplacement.
* Fix test CommandTest::testCreateTable.
* Fix test CommandTest::testsInsertQueryAsColumnValue.
* Fix tests CommandTest::testAlterTable.
* Fix test CommandTest::testCreateView.
* Fix test CommandTest::testTransaction.
* Fix test ConnectionTest::testTransactionShortcutCorrect.
* Fix test ConnectionTest::testTransactionShortcutCustom.
* Fix test ConnectionTest::testEnableQueryLog.
* Fix test QueryBuilder::testAddDropDefaultValue.
* Fix test QueryTest::testUnion.
* Fix test QueryTest::testExpressionInFrom.
* Fix test SchemaTest::testFindUniqueIndexes.
* Fix test QueryBuilderTest::testGetColumnType.
* Fix test ActiveRecordTest::testFind.
* Fix test ExistValidatorTest::testExpresionInAttributeColumnName.
* Fix test UniqueValidatorTest::testExpressionInAttributeColumnName.
* Fix ActiveRecordTest testCastValues(), testDefaultValues.
* Fix test UniqueValidatorTest::testValidateAttributeDefault.
* Fix test UniqueValidatorTest::testValidateEmptyAttributeInStringField.
* Fix test UniqueValidatorTest::testValidateEmptyAttributeInIntField.
* Fix test ActiveRecordTest::testBit.
* Fix test ActiveRecordTest::testBooleanAttribute.
* Fix test ActiveRecordTest::testJoinWithAlias.
* Fix test SchemaTest::testColumnSchema.
* Fix test CommandTest:: testBatchInsertSQL.
* Skip CommandTest::testColumnCase.
* Fix test ConnectionTest::testQuoteValue.
* Should be fixed tests conditionsProvider in QueryBuilderTest.
* Fix ActiveRecordTest.php
* Fix test UniqueValidatorTest.
* Fix test QueryBuilderTest::testUpsert.
* Skip SchemaTest::testCompositeFK.
* yiisoft#17597, pg_constraint.consrc removed in Postgres 12
* yiisoft#17597, load schema for partitioned tables (introduced in Postgres 10)
* messed up with issue number
* #yiisoft#17597 Postgres 12 support, support GENERATED AS IDENTITY columns
* uncleared FileCache leads to falsy failures on subsequent test runs
* moved .sql for postgres 10 and 12 to separate files, added ResetSequence test for GENERATED AS IDENTITY column
View must be deleted before deleting the tables on which it depends, otherwise we will get errors when rerunning the tests in the same environment.
For example:
```
1) yiiunit\framework\db\mysql\CommandTest::testCreateView
yii\db\Exception: SQLSTATE[HY000]: General error: 1356 View 'yii2_test.testCreateView' references invalid table(s) or column(s) or function(s) or definer/invoker of view lack rights to use them
The SQL being executed was: SHOW FULL COLUMNS FROM `testCreateView`
```