YQL-17057: Fix escaping (#1664)

* YQL-17057: Fix escaping

* test

Author: MrLolthe1st

ydb/library/yql/udfs/common/re2/re2_udf.cpp

@@ -382,13 +382,14 @@ namespace {
                 default:
                     if (hasEscape && c == escape) {
                         if (escapeOn) {
-                            result << c;
+                            result << RE2::QuoteMeta(StringPiece(&c, 1));
                         }
                         escapeOn = !escapeOn;
                     } else {
                         if (slash)
                             result << '\\';
                         result << c;
+                        escapeOn = false;
                     }
                     slash = false;
                     break;

ydb/library/yql/udfs/common/re2/test/canondata/result.json

@@ -19,6 +19,11 @@
             "uri": "file://test.test_DefOptions_/results.txt"
         }
     ],
+    "test.test[LikeEscape]": [
+        {
+            "uri": "file://test.test_LikeEscape_/results.txt"
+        }
+    ],
     "test.test[MultipleCaptureGroups]": [
         {
             "uri": "file://test.test_MultipleCaptureGroups_/extracted"

ydb/library/yql/udfs/common/re2/test/canondata/test.test_LikeEscape_/results.txt

@@ -0,0 +1,76 @@
+[
+    {
+        "Write" = [
+            {
+                "Type" = [
+                    "ListType";
+                    [
+                        "StructType";
+                        [
+                            [
+                                "column0";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ];
+                            [
+                                "column1";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ];
+                            [
+                                "column2";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ];
+                            [
+                                "column3";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ];
+                            [
+                                "column4";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ];
+                            [
+                                "column5";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ];
+                            [
+                                "column6";
+                                [
+                                    "DataType";
+                                    "Bool"
+                                ]
+                            ]
+                        ]
+                    ]
+                ];
+                "Data" = [
+                    [
+                        %true;
+                        %true;
+                        %true;
+                        %true;
+                        %true;
+                        %true;
+                        %false
+                    ]
+                ]
+            }
+        ]
+    }
+]

ydb/library/yql/udfs/common/re2/test/cases/LikeEscape.sql

@@ -0,0 +1,7 @@
+SELECT '?' LIKE '%??%' ESCAPE '?',
+       'x_' LIKE '%xxx_' ESCAPE 'x',
+       '[' LIKE '[' ESCAPE '!',
+       '.' LIKE '..' ESCAPE '.',
+       '[' LIKE '[[' ESCAPE '[',
+       'a%b' LIKE '.a.%.b' ESCAPE '.',
+       'x' LIKE '..' ESCAPE '.';