fix: deduplication declare param in yql query, discovery log level info to debug

Author: KirillKurdyukov

src/Ydb.Sdk/src/Ado/Internal/SqlParser.cs

@@ -17,6 +17,7 @@ internal static ParsedResult Parse(string sql)
 
         var newYql = new StringBuilder();
         var paramNames = new List<string>();
+        var foundParamNames = new HashSet<string>();
 
         var prevToken = 0;
 
@@ -114,7 +115,12 @@ internal static ParsedResult Parse(string sql)
 
                     var originalParamName = $"${sql[prevToken .. curToken]}";
 
-                    paramNames.Add(originalParamName);
+                    if (!foundParamNames.Contains(originalParamName))
+                    {
+                        paramNames.Add(originalParamName);
+                    }
+
+                    foundParamNames.Add(originalParamName);
                     newYql.Append(originalParamName);
                     prevToken = curToken;
 

src/Ydb.Sdk/src/Driver.cs

@@ -155,7 +155,7 @@ private async Task<Status> DiscoverEndpoints()
 
         var resultProto = response.Operation.Result.Unpack<ListEndpointsResult>();
 
-        Logger.LogInformation(
+        Logger.LogDebug(
             "Successfully discovered endpoints: {EndpointsCount}, self location: {SelfLocation}, sdk info: {SdkInfo}",
             resultProto.Endpoints.Count, resultProto.SelfLocation, _sdkInfo);
 

src/Ydb.Sdk/tests/Ado/Internal/SqlParserTests.cs

@@ -241,4 +241,13 @@ public void Parse_WhenMultilineStringLiterals_ReturnSql()
 SELECT $param; SELECT $p2; SELECT $p_3;", sql);
         Assert.Equal(new[] { "$param", "$p2", "$p_3" }, paramNames);
     }
+
+    [Fact]
+    public void Parse_WhenRepeatedOneParam_ReturnThisParamInParamNames()
+    {
+        var (sql, paramNames) = SqlParser.Parse("SELECT @a, @a, @a;");
+
+        Assert.Equal("SELECT $a, $a, $a;", sql);
+        Assert.Equal(new[] { "$a" }, paramNames);
+    }
 }