[lake/iceberg] Implement IcebergLakeCatalog for PK Tables (apache#1372)

Author: MehulBatra

fluss-lake/fluss-lake-iceberg/pom.xml

@@ -38,7 +38,6 @@
             <artifactId>iceberg-core</artifactId>
             <version>${iceberg.version}</version>
         </dependency>
-
         <dependency>
             <groupId>com.alibaba.fluss</groupId>
             <artifactId>fluss-common</artifactId>

fluss-lake/fluss-lake-iceberg/src/main/java/com/alibaba/fluss/lake/iceberg/FlussDataTypeToIcebergDataType.java

@@ -0,0 +1,143 @@
+/*
+ * Copyright (c) 2025 Alibaba Group Holding Ltd.
+ *
+ * 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.
+ */
+
+package com.alibaba.fluss.lake.iceberg;
+
+import com.alibaba.fluss.types.ArrayType;
+import com.alibaba.fluss.types.BigIntType;
+import com.alibaba.fluss.types.BinaryType;
+import com.alibaba.fluss.types.BooleanType;
+import com.alibaba.fluss.types.BytesType;
+import com.alibaba.fluss.types.CharType;
+import com.alibaba.fluss.types.DataTypeVisitor;
+import com.alibaba.fluss.types.DateType;
+import com.alibaba.fluss.types.DecimalType;
+import com.alibaba.fluss.types.DoubleType;
+import com.alibaba.fluss.types.FloatType;
+import com.alibaba.fluss.types.IntType;
+import com.alibaba.fluss.types.LocalZonedTimestampType;
+import com.alibaba.fluss.types.MapType;
+import com.alibaba.fluss.types.RowType;
+import com.alibaba.fluss.types.SmallIntType;
+import com.alibaba.fluss.types.StringType;
+import com.alibaba.fluss.types.TimeType;
+import com.alibaba.fluss.types.TimestampType;
+import com.alibaba.fluss.types.TinyIntType;
+
+import org.apache.iceberg.types.Type;
+import org.apache.iceberg.types.Types;
+
+/** Convert from Fluss's data type to Iceberg's data type. */
+public class FlussDataTypeToIcebergDataType implements DataTypeVisitor<Type> {
+
+    public static final FlussDataTypeToIcebergDataType INSTANCE =
+            new FlussDataTypeToIcebergDataType();
+
+    @Override
+    public Type visit(CharType charType) {
+        return Types.StringType.get();
+    }
+
+    @Override
+    public Type visit(StringType stringType) {
+        return Types.StringType.get();
+    }
+
+    @Override
+    public Type visit(BooleanType booleanType) {
+        return Types.BooleanType.get();
+    }
+
+    @Override
+    public Type visit(BinaryType binaryType) {
+        return Types.BinaryType.get();
+    }
+
+    @Override
+    public Type visit(BytesType bytesType) {
+        return Types.BinaryType.get();
+    }
+
+    @Override
+    public Type visit(DecimalType decimalType) {
+        return Types.DecimalType.of(decimalType.getPrecision(), decimalType.getScale());
+    }
+
+    @Override
+    public Type visit(TinyIntType tinyIntType) {
+        return Types.IntegerType.get();
+    }
+
+    @Override
+    public Type visit(SmallIntType smallIntType) {
+        return Types.IntegerType.get();
+    }
+
+    @Override
+    public Type visit(IntType intType) {
+        return Types.IntegerType.get();
+    }
+
+    @Override
+    public Type visit(BigIntType bigIntType) {
+        return Types.LongType.get();
+    }
+
+    @Override
+    public Type visit(FloatType floatType) {
+        return Types.FloatType.get();
+    }
+
+    @Override
+    public Type visit(DoubleType doubleType) {
+        return Types.DoubleType.get();
+    }
+
+    @Override
+    public Type visit(DateType dateType) {
+        return Types.DateType.get();
+    }
+
+    @Override
+    public Type visit(TimeType timeType) {
+        return Types.TimeType.get();
+    }
+
+    @Override
+    public Type visit(TimestampType timestampType) {
+        return Types.TimestampType.withoutZone();
+    }
+
+    @Override
+    public Type visit(LocalZonedTimestampType localZonedTimestampType) {
+        return Types.TimestampType.withZone();
+    }
+
+    @Override
+    public Type visit(ArrayType arrayType) {
+        throw new UnsupportedOperationException("Unsupported array type");
+    }
+
+    @Override
+    public Type visit(MapType mapType) {
+        throw new UnsupportedOperationException("Unsupported map type");
+    }
+
+    @Override
+    public Type visit(RowType rowType) {
+        throw new UnsupportedOperationException("Unsupported row type");
+    }
+}