From dcfc35316f382878827e662c3224ca7e4cbc09ef Mon Sep 17 00:00:00 2001
From: Jiquan Long <jiquan.long@zilliz.com>
Date: Thu, 29 Feb 2024 10:41:00 +0800
Subject: [PATCH] fix: underscore matching not work (#30826)

issue: https://github.com/milvus-io/milvus/issues/30721

Signed-off-by: longjiquan <jiquan.long@zilliz.com>
---
 internal/parser/planparserv2/pattern_match.go      | 2 +-
 internal/parser/planparserv2/pattern_match_test.go | 6 ++++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/internal/parser/planparserv2/pattern_match.go b/internal/parser/planparserv2/pattern_match.go
index cc84b9bd5d..1bd6dbe6ec 100644
--- a/internal/parser/planparserv2/pattern_match.go
+++ b/internal/parser/planparserv2/pattern_match.go
@@ -5,7 +5,7 @@ import (
 )
 
 var wildcards = map[byte]struct{}{
-	// '_': {}, // TODO
+	'_': {},
 	'%': {},
 }
 
diff --git a/internal/parser/planparserv2/pattern_match_test.go b/internal/parser/planparserv2/pattern_match_test.go
index 9d3ad31a20..f0cdd48b9f 100644
--- a/internal/parser/planparserv2/pattern_match_test.go
+++ b/internal/parser/planparserv2/pattern_match_test.go
@@ -121,6 +121,12 @@ func Test_translatePatternMatch(t *testing.T) {
 			wantOperand: "prefix%suffix",
 			wantErr:     false,
 		},
+		{
+			args:        args{pattern: "_0"},
+			wantOp:      planpb.OpType_Match,
+			wantOperand: "_0",
+			wantErr:     false,
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {