Tweaks to expr handlers

store/rdbms/ast_transformer.go

@@ -176,6 +176,11 @@ var (
 			Result:  wrapRes("Number"),
 			Handler: makeGenericFilterFncHandler("YEAR"),
 		},
+		"month": {
+			Args:    collectParams(true, "DateTime"),
+			Result:  wrapRes("Number"),
+			Handler: makeGenericFilterFncHandler("MONTH"),
+		},
 		"date": {
 			Args:    collectParams(true, "DateTime"),
 			Result:  wrapRes("Number"),
@@ -194,12 +199,12 @@ var (
 		"float": {
 			Args:    collectParams(true, "Any"),
 			Result:  wrapRes("Float"),
-			Handler: makeGenericTypecastHandler("FLOAT"),
+			Handler: makeGenericTypecastHandler("DECIMAL"),
 		},
 		"int": {
 			Args:    collectParams(true, "Any"),
 			Result:  wrapRes("Float"),
-			Handler: makeGenericTypecastHandler("INT"),
+			Handler: makeGenericTypecastHandler("SIGNED"),
 		},
 	}
 )

store/sqlite3/sql_functions.go

@@ -42,6 +42,16 @@ var (
 			args = aa[0].Args
 			return
 		},
+		"month": func(aa ...rdbms.FormattedASTArgs) (out string, args []interface{}, selfEnclosed bool, err error) {
+			if len(aa) != 1 {
+				err = fmt.Errorf("expecting 1 arguments, got %d", len(aa))
+				return
+			}
+
+			out = fmt.Sprintf("STRFTIME('%%m', %s)", aa[0].S)
+			args = aa[0].Args
+			return
+		},
 		"date": func(aa ...rdbms.FormattedASTArgs) (out string, args []interface{}, selfEnclosed bool, err error) {
 			if len(aa) != 1 {
 				err = fmt.Errorf("expecting 1 arguments, got %d", len(aa))
@@ -52,6 +62,20 @@ var (
 			args = aa[0].Args
 			return
 		},
+
+		// - typecast
+		"float": func(aa ...rdbms.FormattedASTArgs) (out string, args []interface{}, selfEnclosed bool, err error) {
+			selfEnclosed = true
+
+			if len(aa) != 1 {
+				err = fmt.Errorf("expecting 1 argument, got %d", len(aa))
+				return
+			}
+
+			out = fmt.Sprintf("CAST(%s AS FLOAT)", aa[0].S)
+			args = aa[0].Args
+			return
+		},
 	}
 )