Add DOUBLE as data type name alias for FLOAT64

This fixes parsing of SimpleAggregateFunction(sum, Double) where
Double should be recognized as a data type, not an identifier.

Fixed 6 tests:
- 00915_simple_aggregate_function/stmt3
- 00915_simple_aggregate_function_summing_merge_tree/stmt3
- 01392_column_resolve/stmt1, stmt2
- 02775_show_columns_called_from_clickhouse/stmt4
- 02790_fix_coredump_when_compile_expression/stmt1

Author: claude

parser/parser.go

@@ -4503,7 +4503,7 @@ func (p *Parser) isDataTypeName(name string) bool {
 	types := []string{
 		"INT", "INT8", "INT16", "INT32", "INT64", "INT128", "INT256",
 		"UINT8", "UINT16", "UINT32", "UINT64", "UINT128", "UINT256",
-		"FLOAT32", "FLOAT64", "FLOAT", "BFLOAT16",
+		"FLOAT32", "FLOAT64", "FLOAT", "DOUBLE", "BFLOAT16",
 		"DECIMAL", "DECIMAL32", "DECIMAL64", "DECIMAL128", "DECIMAL256", "DEC",
 		"STRING", "FIXEDSTRING",
 		"UUID", "DATE", "DATE32", "DATETIME", "DATETIME64",

parser/testdata/00915_simple_aggregate_function/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt3": true
-  }
-}
+{}

parser/testdata/00915_simple_aggregate_function_summing_merge_tree/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt3": true
-  }
-}
+{}

parser/testdata/01392_column_resolve/metadata.json

@@ -1,6 +1 @@
-{
-  "explain_todo": {
-    "stmt1": true,
-    "stmt2": true
-  }
-}
+{}

parser/testdata/02775_show_columns_called_from_clickhouse/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt4": true
-  }
-}
+{}

parser/testdata/02790_fix_coredump_when_compile_expression/metadata.json

@@ -1,5 +1 @@
-{
-  "explain_todo": {
-    "stmt1": true
-  }
-}
+{}