fix(Column): Explicitly name default constraint for MSSQL

* update MSSQL for DEFAULT constraint

* Fix failing test for `last`

* Update MSSQL tests and wrap default constriant name

* Allow for a table level `default` for removing default constraints with generated names

This method won't actually create a constraint, but it is used for removing constraints
with auto-generated names.

For instance, if you used the default name in
```
schema.create( "my_table", function( table ) {
    table.boolean( "trueOrFalse" ).default( 0 );
} );

```
it may not be obvious that the constraint name is `df_my_table_trueOrFalse`.

This method let's you stay oblivious to the auto-generated name when dropping the constraint.

```
schema.alter( "my_table", function( table ) {
    table.dropConstraint( table.default( "trueOrFalse" ) );
    table.dropColumn( "trueOrFalse" );
} );
```

models/Grammars/BaseGrammar.cfc

@@ -796,7 +796,7 @@ component displayname="Grammar" accessors="true" {
             generateNullConstraint( column ),
             generateUniqueConstraint( column, blueprint ),
             generateAutoIncrement( column, blueprint ),
-            generateDefault( column ),
+            generateDefault( column, blueprint ),
             generateComment( column, blueprint )
         ], function( item ) {
             return item != "";

models/Grammars/MSSQLGrammar.cfc

@@ -139,6 +139,10 @@ component extends="qb.models.Grammars.BaseGrammar" {
         return column.getAutoIncrement() ? "IDENTITY" : "";
     }
 
+    function generateDefault( column, blueprint ) {
+        return column.getDefault() != "" ? "CONSTRAINT #wrapValue( "df_#blueprint.getTable()#_#column.getName()#" )# DEFAULT #column.getDefault()#" : "";
+    }
+
     function generateComment( column ) {
         return "";
     }

models/Schema/Blueprint.cfc

@@ -293,6 +293,20 @@ component accessors="true" {
         return appendIndex( type = "unique", columns = columns, name = name );
     }
 
+    /**
+    * Create a default constraint from a column.
+    *
+    * @columns The column that makes up the default constraint.
+    * @name    The name of the default constraint.
+    *          Default: A generated name consisting of the table name and column name.
+    *
+    * @returns The created TableIndex instance.
+    */
+    function default( column, name ) {
+        arguments.name = isNull( name ) ? "df_#getTable()#_#column#" : arguments.name;
+        return createIndex( type = "default", columns = column, name = name );
+    }
+
 
     /*======================================
     =            Alter Commands            =
@@ -386,6 +400,12 @@ component accessors="true" {
     }
 
     function appendIndex() {
+        var newIndex = createIndex( argumentCollection = arguments );
+        variables.indexes.append( newIndex );
+        return newIndex;
+    }
+
+    function createIndex() {
         var newIndex = new TableIndex( this );
         var indexMetadata = getMetadata( newIndex );
         var functionNames = indexMetadata.functions.map( function( func ) {
@@ -396,7 +416,6 @@ component accessors="true" {
                 invoke( newIndex, "set#arg#", { 1 = arguments[ arg ] } );
             }
         }
-        variables.indexes.append( newIndex );
         return newIndex;
     }
 

tests/resources/AbstractSchemaBuilderSpec.cfc

@@ -850,8 +850,6 @@ component extends="testbox.system.BaseSpec" {
         if ( ! isArray( statements ) ) {
             statements = [ statements ];
         }
-        debug( statements );
-        debug( expected );
         expect( statements ).toBeArray();
         expect( statements ).toHaveLength( arrayLen( expected ) );
         for ( var i = 1; i <= expected.len(); i++ ) {

tests/specs/Query/Abstract/QueryExecutionSpec.cfc

@@ -123,7 +123,7 @@ component extends="testbox.system.BaseSpec" {
                     var builder = getBuilder();
                     var expectedQuery = queryNew( "id,name", "integer,varchar", [ { id = 1, name = "foo" }, { id = 2, name = "test" } ] );
                     builder.$( "runQuery" ).$args(
-                        sql = "SELECT * FROM ""users"" WHERE ""name"" = ? LIMIT 1",
+                        sql = "SELECT * FROM ""users""",
                         options = {}
                     ).$results( expectedQuery );
 

tests/specs/Schema/MSSQLSchemaBuilderSpec.cfc

@@ -9,7 +9,7 @@ component extends="tests.resources.AbstractSchemaBuilderSpec" {
     }
 
     function complicatedTable() {
-        return [ "CREATE TABLE [users] ([id] INTEGER NOT NULL IDENTITY, [username] NVARCHAR(255) NOT NULL, [first_name] NVARCHAR(255) NOT NULL, [last_name] NVARCHAR(255) NOT NULL, [password] NVARCHAR(100) NOT NULL, [country_id] INTEGER NOT NULL, [created_date] DATETIME2 NOT NULL DEFAULT CURRENT_TIMESTAMP, [modified_date] DATETIME2 NOT NULL DEFAULT CURRENT_TIMESTAMP, CONSTRAINT [pk_users_id] PRIMARY KEY ([id]), CONSTRAINT [fk_users_country_id] FOREIGN KEY ([country_id]) REFERENCES [countries] ([id]) ON UPDATE NO ACTION ON DELETE CASCADE)" ];
+        return [ "CREATE TABLE [users] ([id] INTEGER NOT NULL IDENTITY, [username] NVARCHAR(255) NOT NULL, [first_name] NVARCHAR(255) NOT NULL, [last_name] NVARCHAR(255) NOT NULL, [password] NVARCHAR(100) NOT NULL, [country_id] INTEGER NOT NULL, [created_date] DATETIME2 NOT NULL CONSTRAINT [df_users_created_date] DEFAULT CURRENT_TIMESTAMP, [modified_date] DATETIME2 NOT NULL CONSTRAINT [df_users_modified_date] DEFAULT CURRENT_TIMESTAMP, CONSTRAINT [pk_users_id] PRIMARY KEY ([id]), CONSTRAINT [fk_users_country_id] FOREIGN KEY ([country_id]) REFERENCES [countries] ([id]) ON UPDATE NO ACTION ON DELETE CASCADE)" ];
     }
 
     function bigIncrements() {
@@ -231,7 +231,7 @@ component extends="tests.resources.AbstractSchemaBuilderSpec" {
     }
 
     function default() {
-        return [ "CREATE TABLE [users] ([active] NCHAR(1) NOT NULL DEFAULT 'Y')" ];
+        return [ "CREATE TABLE [users] ([active] NCHAR(1) NOT NULL CONSTRAINT [df_users_active] DEFAULT 'Y')" ];
     }
 
     function nullable() {