diff --git a/ydb/library/yql/providers/generic/provider/ut/pushdown/pushdown_ut.cpp b/ydb/library/yql/providers/generic/provider/ut/pushdown/pushdown_ut.cpp
index 937b5b0c60a4..0c7add0a2ac7 100644
--- a/ydb/library/yql/providers/generic/provider/ut/pushdown/pushdown_ut.cpp
+++ b/ydb/library/yql/providers/generic/provider/ut/pushdown/pushdown_ut.cpp
@@ -372,7 +372,7 @@ Y_UNIT_TEST_SUITE_F(PushdownTest, TPushdownFixture) {
             R"ast(
                 (Coalesce
                     (!= (Member $row '"col_optional_uint64") (Member $row '"col_uint32"))
-                    (Bool '"true")
+                    (Bool '"false")
                 )
                 )ast",
             R"proto(
@@ -388,6 +388,44 @@ Y_UNIT_TEST_SUITE_F(PushdownTest, TPushdownFixture) {
             )proto");
     }
 
+    Y_UNIT_TEST(TrueCoalesce) {
+        AssertFilter(
+            // Note that R"ast()ast" is empty string!
+            R"ast(
+                (Coalesce
+                    (!= (Member $row '"col_optional_uint64") (Member $row '"col_uint32"))
+                    (Bool '"true")
+                )
+                )ast",
+            R"proto(
+                coalesce {
+                    operands {
+                        comparison {
+                            operation: NE
+                            left_value {
+                                column: "col_optional_uint64"
+                            }
+                            right_value {
+                                column: "col_uint32"
+                            }
+                        }
+                    }
+                    operands {
+                        bool_expression {
+                            typed_value {
+                                type {
+                                    type_id: BOOL
+                                }
+                                value {
+                                    bool_value: true
+                                }
+                            }
+                        }
+                    }
+                }
+            )proto");
+    }
+
     Y_UNIT_TEST(CmpInt16AndInt32) {
         AssertFilter(
             // Note that R"ast()ast" is empty string!
@@ -421,7 +459,7 @@ Y_UNIT_TEST_SUITE_F(PushdownTest, TPushdownFixture) {
                         (< (Unwrap (/ (Int64 '42) (Member $row '"col_int64"))) (Int64 '10))
                         (>= (Member $row '"col_uint32") (- (Uint32 '15) (Uint32 '1)))
                     )
-                    (Bool '"true")
+                    (Bool '"false")
                 )
                 )ast",
             R"proto(
@@ -515,7 +553,7 @@ Y_UNIT_TEST_SUITE_F(PushdownTest, TPushdownFixture) {
                         (< (Unwrap (/ (Int64 '42) (Member $row '"col_int64"))) (Int64 '10))
                         (>= (Member $row '"col_uint32") (Uint32 '15))
                     )
-                    (Bool '"true")
+                    (Bool '"false")
                 )
                 )ast",
             R"proto(
@@ -600,7 +638,7 @@ Y_UNIT_TEST_SUITE_F(PushdownTest, TPushdownFixture) {
                         (Member $row '"col_utf8")
                         (Member $row '"col_optional_utf8")
                     )
-                    (Bool '"true")
+                    (Bool '"false")
                 )
                 )ast");
     }
diff --git a/ydb/library/yql/providers/generic/provider/yql_generic_predicate_pushdown.cpp b/ydb/library/yql/providers/generic/provider/yql_generic_predicate_pushdown.cpp
index a3dd9ff1fe44..e08e09c9a545 100644
--- a/ydb/library/yql/providers/generic/provider/yql_generic_predicate_pushdown.cpp
+++ b/ydb/library/yql/providers/generic/provider/yql_generic_predicate_pushdown.cpp
@@ -69,6 +69,7 @@ namespace NYql {
             }
 
             // data
+            MATCH_ATOM(Bool, BOOL, bool, bool);
             MATCH_ATOM(Int8, INT8, int32, i8);
             MATCH_ATOM(Uint8, UINT8, uint32, ui8);
             MATCH_ATOM(Int16, INT16, int32, i16);
@@ -140,9 +141,7 @@ namespace NYql {
             if (depth == 0) {
                 auto value = coalesce.Value().Maybe<TCoBool>();
                 if (value && TStringBuf(value.Cast().Literal()) == "false"sv) {
-                    if (!SerializePredicate(TExprBase(coalesce.Predicate()), proto, arg, err, 0)) {
-                        return false;
-                    }
+                    return SerializePredicate(TExprBase(coalesce.Predicate()), proto, arg, err, 0);
                 }
             }
 
@@ -259,8 +258,9 @@ namespace NYql {
                 return SerializePredicate(TExprBase(just.Cast().Input()), proto, arg, err, depth + 1);
             }
 
-            err << "unknown predicate: " << predicate.Raw()->Content();
-            return false;
+            // Try to serialize predicate as boolean expression
+            // For example single bool value TRUE in COALESCE or IF
+            return SerializeExpression(predicate, proto->mutable_bool_expression()->mutable_value(), arg, err);
         }
     }
 
@@ -271,7 +271,7 @@ namespace NYql {
     TString FormatValue(const Ydb::TypedValue& value) {
         switch (value.value().value_case()) {
             case  Ydb::Value::kBoolValue:
-                return ToString(value.value().bool_value());
+                return value.value().bool_value() ? "TRUE" : "FALSE";
             case Ydb::Value::kInt32Value:
                 return ToString(value.value().int32_value());
             case Ydb::Value::kUint32Value: