Nake DT query parser handle two comment positions

The "correct" place to specify the query comment in a dynamic table DDL
is at the end of the metadata argument list, right before the query.
However, when retrieving an existing query from Snowflake using SHOW
DYNAMIC TABLE, the comment is placed at the beginning of the metadata
argument list.

This commit updates the DT query parser to handle comments that can show
up in either position.

pkg/snowflake/parser.go

@@ -111,6 +111,8 @@ func (e *ViewSelectStatementExtractor) ExtractDynamicTable() (string, error) {
 	e.consumeSpace()
 	e.consumeTokenParameter("warehouse")
 	e.consumeSpace()
+	e.consumeComment()
+	e.consumeSpace()
 	e.consumeToken("as")
 	e.consumeSpace()
 

pkg/snowflake/parser_test.go

@@ -147,7 +147,8 @@ lag = 'DOWNSTREAM'
 refresh_mode = 'AUTO'
 initialize = 'ON_CREATE'
 warehouse = COMPUTE_WH
-as select * from bar;`
+as select *
+from bar;`
 
 	multilineComment := `
 create dynamic table foo
@@ -160,10 +161,14 @@ as
 select *
 from bar;`
 
-	comment := `create dynamic table foo comment = 'asdf' lag = 'DOWNSTREAM' refresh_mode = 'AUTO' initialize = 'ON_CREATE' warehouse = COMPUTE_WH as select * from bar;`
-	commentEscape := `create dynamic table foo comment = 'asdf\'s are fun' lag = 'DOWNSTREAM' refresh_mode = 'AUTO' initialize = 'ON_CREATE' warehouse = COMPUTE_WH as select * from bar;`
-	orReplace := `create or replace dynamic table foo comment = 'asdf' lag = 'DOWNSTREAM' refresh_mode = 'AUTO' initialize = 'ON_CREATE' warehouse = COMPUTE_WH as select * from bar;`
-	identifier := `create or replace dynamic table "foo"."bar"."bam" comment = 'asdf\'s are fun' lag = 'DOWNSTREAM' refresh_mode = 'AUTO' initialize = 'ON_CREATE' warehouse = COMPUTE_WH as select * from bar;`
+	comment := `create dynamic table foo lag = 'DOWNSTREAM' refresh_mode = 'AUTO' initialize = 'ON_CREATE' warehouse = COMPUTE_WH comment = 'asdf' as select * from bar;`
+	commentEscape := `create dynamic table foo lag = 'DOWNSTREAM' refresh_mode = 'AUTO' initialize = 'ON_CREATE' warehouse = COMPUTE_WH comment = 'asdf\'s are fun' as select * from bar;`
+	orReplace := `create or replace dynamic table foo lag = 'DOWNSTREAM' refresh_mode = 'AUTO' initialize = 'ON_CREATE' warehouse = COMPUTE_WH comment = 'asdf' as select * from bar;`
+	identifier := `create or replace dynamic table "foo"."bar"."bam" lag = 'DOWNSTREAM' refresh_mode = 'AUTO' initialize = 'ON_CREATE' warehouse = COMPUTE_WH comment = 'asdf\'s are fun' as select * from bar;`
+	// running SHOW DYNAMIC TABLE in Snowflake actually returns the query with
+	// the comment before other parameters, even though this is inconsistent
+	// with the order they are specified in CREATE DYNAMIC TABLE
+	commentBeforeOtherParams := `create dynamic table foo comment = 'asdf\'s are fun' lag = 'DOWNSTREAM' refresh_mode = 'AUTO' initialize = 'ON_CREATE' warehouse = COMPUTE_WH as select * from bar;`
 
 	type args struct {
 		input string
@@ -183,6 +188,7 @@ from bar;`
 		{"commentEscape", args{commentEscape}, "select * from bar;", false},
 		{"orReplace", args{orReplace}, "select * from bar;", false},
 		{"identifier", args{identifier}, "select * from bar;", false},
+		{"commentBeforeOtherParams", args{commentBeforeOtherParams}, "select * from bar;", false},
 	}
 	for _, tt := range tests {
 		tt := tt