stmt := gorm.Statement{DB: DB}
		stmt.Parse(&Blog{})
		stmt.Schema.LookUpField("ID").Unique = true
		stmt.Parse(&Tag{})
		stmt.Schema.LookUpField("ID").Unique = true
		// postgers only allow unique constraint matching given keys
	}

	DB.Migrator().DropTable(&Blog{}, &Tag{}, "blog_tags", "locale_blog_tags", "shared_blog_tags")
	if err := DB.AutoMigrate(&Blog{}, &Tag{}); err != nil {

	}

	expectedConstraintName := "fk_my_schema_a_very_very_very_very_very_very_very_very_l4db13eec"
	constraint := s.Relationships.Relations["Author"].ParseConstraint()

	if constraint.Name != expectedConstraintName {
		t.Fatalf(
			"expected constraint name %s, got %s",
			expectedConstraintName,
			constraint.Name,
		)
	}

	DropColumn(dst interface{}, field string) error
	AlterColumn(dst interface{}, field string) error
	MigrateColumn(dst interface{}, field *schema.Field, columnType ColumnType) error
	// MigrateColumnUnique migrate column's UNIQUE constraint, it's part of MigrateColumn.
	MigrateColumnUnique(dst interface{}, field *schema.Field, columnType ColumnType) error
	HasColumn(dst interface{}, field string) bool
	RenameColumn(dst interface{}, oldName, field string) error

    map = MutableClassToInstanceMap.create();
  }

  public void testConstraint() {

    /**
     * We'll give ourselves a pass on testing all the possible ways of breaking the constraint,
     * because we know that newClassMap() is implemented using ConstrainedMap which is itself
     * well-tested. A purist would object to this, but what can I say, we're dirty cheaters.
     */

org.checkerframework.framework.util.defaults
org.checkerframework.framework.util.dependenttypes
org.checkerframework.framework.util.element
org.checkerframework.framework.util.typeinference
org.checkerframework.framework.util.typeinference.constraint
org.checkerframework.framework.util.typeinference.solver
org.checkerframework.javacutil
org.checkerframework.javacutil.dist
org.checkerframework.javacutil.trees
org.eclipse.jdt.annotation
org.eclipse.jgit.annotations

import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A bimap (or "bidirectional map") is a map that preserves the uniqueness of its values as well as
 * that of its keys. This constraint enables bimaps to support an "inverse view", which is another
 * bimap containing the same entries as this bimap but with reversed keys and values.
 *
 * <h3>Implementations</h3>
 *
 * <ul>

            }

            @Override
            public VersionConstraint parseVersionConstraint(String constraint) {
                throw new IllegalArgumentException("constraint not supported by this parser");
            }

            @Override
            public boolean isSnapshot(String version) {
                requireNonNull(version, "version");

			t.Fatalf("failed to drop constraint %v, got error %v", name, err)
		}

		if DB.Migrator().HasConstraint(&User{}, name) {
			t.Fatalf("constraint %v should been deleted", name)
		}

		if err := DB.Migrator().CreateConstraint(&User{}, name); err != nil {
			t.Fatalf("failed to create constraint %v, got error %v", name, err)
		}

## Pod Startup

### Pod Startup Requirements

During new Pod startup, we MUST meet the constraint that the network is ready the instant the application starts (including `initContainers`!).
This is critical -- issues around this were the [top issue with sidecars](https://github.com/istio/istio/issues/11130).

import javax.annotation.CheckForNull;
import org.checkerframework.checker.nullness.qual.Nullable;

/**
 * A bimap (or "bidirectional map") is a map that preserves the uniqueness of its values as well as
 * that of its keys. This constraint enables bimaps to support an "inverse view", which is another
 * bimap containing the same entries as this bimap but with reversed keys and values.
 *
 * <h3>Implementations</h3>
 *
 * <ul>