duckdb: migrate to upstream build (#6765)

projects/duckdb/Dockerfile

@@ -15,7 +15,6 @@
 ################################################################################
 
 FROM gcr.io/oss-fuzz-base/base-builder
-RUN git clone https://github.com/duckdb/duckdb duckdb
+RUN git clone --depth=1 https://github.com/duckdb/duckdb duckdb
 WORKDIR duckdb
 COPY build.sh $SRC/
-COPY parse_fuzz_test.cpp $SRC/duckdb/parse_fuzz_test.cpp

projects/duckdb/build.sh

@@ -17,7 +17,7 @@
 
 make
 THIRD_PARTY_LIBS=$(find ./build/release/third_party/ -name "*.a")
-$CXX $CXXFLAGS $LIB_FUZZING_ENGINE $SRC/duckdb/parse_fuzz_test.cpp \
+$CXX $CXXFLAGS $LIB_FUZZING_ENGINE ./test/ossfuzz/parse_fuzz_test.cpp \
     -o $OUT/parse_fuzz_test -I./ -I./src/include \
     ./build/release/src/libduckdb_static.a \
     ${THIRD_PARTY_LIBS}

projects/duckdb/parse_fuzz_test.cpp

@@ -1,23 +0,0 @@
-/* Copyright 2021 Google LLC
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-      http://www.apache.org/licenses/LICENSE-2.0
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-#include "duckdb/parser/parser.hpp"
-
-extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
-{
-    std::string input(reinterpret_cast<const char*>(data), size);
-    duckdb::Parser parser;
-    try {
-       parser.ParseQuery(input);
-    } catch (std::exception &e) {}
-
-    return 0;
-}