velaql support indexing into exported array field (#5320)

Signed-off-by: hnd4r7 <307365651@qq.com>

Signed-off-by: hnd4r7 <307365651@qq.com>

pkg/velaql/parse.go

@@ -37,7 +37,7 @@ type QueryView struct {
 
 const (
 	// PatternQL is the pattern string of velaQL, velaQL's query syntax is `ViewName{key1=value1 ,key2="value2",}.Export`
-	PatternQL = `(?P<view>[a-z0-9](?:[a-z0-9\-]{0,61}[a-z0-9])?)(?P<parameter>{.*?})?\.?(?P<export>[_a-zA-Z][\._a-zA-Z0-9]*)?`
+	PatternQL = `(?P<view>[a-z0-9](?:[a-z0-9\-]{0,61}[a-z0-9])?)(?P<parameter>{.*?})?\.?(?P<export>[_a-zA-Z][\._a-zA-Z0-9\[\]]*)?`
 	// PatternKV is the pattern string of parameter
 	PatternKV = `(?P<key>[^=]+)=(?P<value>[^=]*?)(?:,|$)`
 	// KeyWordView represent view keyword

pkg/velaql/parse_test.go

@@ -58,6 +58,13 @@ func TestParseVelaQL(t *testing.T) {
 			Export: "output.value.spec",
 		},
 		err: nil,
+	}, {
+		ql: `view{test=true}.output.value[0].spec`,
+		query: QueryView{
+			View:   "view",
+			Export: "output.value[0].spec",
+		},
+		err: nil,
 	}}
 
 	for _, testcase := range testcases {