support get view

paimon-core/src/main/java/org/apache/paimon/rest/RESTCatalog.java

@@ -54,6 +54,7 @@
 import org.apache.paimon.rest.responses.ErrorResponseResourceType;
 import org.apache.paimon.rest.responses.GetDatabaseResponse;
 import org.apache.paimon.rest.responses.GetTableResponse;
+import org.apache.paimon.rest.responses.GetViewResponse;
 import org.apache.paimon.rest.responses.ListDatabasesResponse;
 import org.apache.paimon.rest.responses.ListPartitionsResponse;
 import org.apache.paimon.rest.responses.ListTablesResponse;
@@ -68,6 +69,8 @@
 import org.apache.paimon.table.sink.BatchWriteBuilder;
 import org.apache.paimon.utils.Pair;
 import org.apache.paimon.utils.Preconditions;
+import org.apache.paimon.view.View;
+import org.apache.paimon.view.ViewImpl;
 
 import org.apache.paimon.shade.guava30.com.google.common.collect.ImmutableList;
 
@@ -505,6 +508,49 @@ public List<Partition> listPartitions(Identifier identifier) throws TableNotExis
         return response.getPartitions();
     }
 
+    @Override
+    public View getView(Identifier identifier) throws ViewNotExistException {
+        try {
+            GetViewResponse response =
+                    client.get(
+                            resourcePaths.view(
+                                    identifier.getDatabaseName(), identifier.getTableName()),
+                            GetViewResponse.class,
+                            headers());
+            return new ViewImpl(
+                    identifier,
+                    response.getSchema().rowType(),
+                    response.getSchema().query(),
+                    response.getSchema().comment(),
+                    response.getSchema().options());
+        } catch (NoSuchResourceException e) {
+            throw new ViewNotExistException(identifier);
+        }
+    }
+
+    @Override
+    public void dropView(Identifier identifier, boolean ignoreIfNotExists)
+            throws ViewNotExistException {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void createView(Identifier identifier, View view, boolean ignoreIfExists)
+            throws ViewAlreadyExistException, DatabaseNotExistException {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public List<String> listViews(String databaseName) throws DatabaseNotExistException {
+        throw new UnsupportedOperationException();
+    }
+
+    @Override
+    public void renameView(Identifier fromView, Identifier toView, boolean ignoreIfNotExists)
+            throws ViewNotExistException, ViewAlreadyExistException {
+        throw new UnsupportedOperationException();
+    }
+
     @Override
     public boolean caseSensitive() {
         return options.getOptional(CASE_SENSITIVE).orElse(true);

paimon-core/src/main/java/org/apache/paimon/rest/ResourcePaths.java

@@ -84,4 +84,8 @@ public String markDonePartitions(String databaseName, String tableName) {
         return SLASH.join(
                 V1, prefix, DATABASES, databaseName, TABLES, tableName, "partitions", "mark");
     }
+
+    public String view(String databaseName, String viewName) {
+        return SLASH.join(V1, prefix, DATABASES, databaseName, "views", viewName);
+    }
 }

paimon-core/src/main/java/org/apache/paimon/rest/responses/GetViewResponse.java

@@ -0,0 +1,69 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.paimon.rest.responses;
+
+import org.apache.paimon.rest.RESTResponse;
+
+import org.apache.paimon.shade.jackson2.com.fasterxml.jackson.annotation.JsonCreator;
+import org.apache.paimon.shade.jackson2.com.fasterxml.jackson.annotation.JsonGetter;
+import org.apache.paimon.shade.jackson2.com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+import org.apache.paimon.shade.jackson2.com.fasterxml.jackson.annotation.JsonProperty;
+
+/** Response for getting view. */
+@JsonIgnoreProperties(ignoreUnknown = true)
+public class GetViewResponse implements RESTResponse {
+
+    private static final String FIELD_ID = "id";
+    private static final String FIELD_NAME = "name";
+    private static final String FIELD_SCHEMA = "schema";
+
+    @JsonProperty(FIELD_ID)
+    private final String id;
+
+    @JsonProperty(FIELD_NAME)
+    private final String name;
+
+    @JsonProperty(FIELD_SCHEMA)
+    private final ViewSchema schema;
+
+    @JsonCreator
+    public GetViewResponse(
+            @JsonProperty(FIELD_ID) String id,
+            @JsonProperty(FIELD_NAME) String name,
+            @JsonProperty(FIELD_SCHEMA) ViewSchema schema) {
+        this.id = id;
+        this.name = name;
+        this.schema = schema;
+    }
+
+    @JsonGetter(FIELD_ID)
+    public String getId() {
+        return this.id;
+    }
+
+    @JsonGetter(FIELD_NAME)
+    public String getName() {
+        return this.name;
+    }
+
+    @JsonGetter(FIELD_SCHEMA)
+    public ViewSchema getSchema() {
+        return this.schema;
+    }
+}

paimon-core/src/main/java/org/apache/paimon/rest/responses/ViewSchema.java

@@ -0,0 +1,90 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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 org.apache.paimon.rest.responses;
+
+import org.apache.paimon.types.DataField;
+import org.apache.paimon.types.RowType;
+
+import org.apache.paimon.shade.jackson2.com.fasterxml.jackson.annotation.JsonCreator;
+import org.apache.paimon.shade.jackson2.com.fasterxml.jackson.annotation.JsonGetter;
+import org.apache.paimon.shade.jackson2.com.fasterxml.jackson.annotation.JsonInclude;
+import org.apache.paimon.shade.jackson2.com.fasterxml.jackson.annotation.JsonProperty;
+
+import javax.annotation.Nullable;
+
+import java.util.List;
+import java.util.Map;
+
+public class ViewSchema {
+    private static final String FIELD_FIELDS = "fields";
+    private static final String FIELD_OPTIONS = "options";
+    private static final String FIELD_COMMENT = "comment";
+    private static final String FIELD_QUERY = "query";
+
+    @JsonProperty(FIELD_QUERY)
+    private final String query;
+
+    @Nullable
+    @JsonProperty(FIELD_COMMENT)
+    @JsonInclude(JsonInclude.Include.NON_NULL)
+    private final String comment;
+
+    @JsonProperty(FIELD_OPTIONS)
+    private final Map<String, String> options;
+
+    @JsonProperty(FIELD_FIELDS)
+    private final List<DataField> fields;
+
+    @JsonCreator
+    public ViewSchema(
+            @JsonProperty(FIELD_FIELDS) List<DataField> fields,
+            @JsonProperty(FIELD_OPTIONS) Map<String, String> options,
+            @Nullable @JsonProperty(FIELD_COMMENT) String comment,
+            @JsonProperty(FIELD_QUERY) String query) {
+        this.fields = fields;
+        this.options = options;
+        this.comment = comment;
+        this.query = query;
+    }
+
+    public RowType rowType() {
+        return new RowType(fields);
+    }
+
+    @JsonGetter(FIELD_QUERY)
+    public String query() {
+        return query;
+    }
+
+    @Nullable
+    @JsonGetter(FIELD_COMMENT)
+    public String comment() {
+        return comment;
+    }
+
+    @JsonGetter(FIELD_OPTIONS)
+    public Map<String, String> options() {
+        return options;
+    }
+
+    @JsonGetter(FIELD_FIELDS)
+    public List<DataField> fields() {
+        return fields;
+    }
+}

paimon-core/src/main/java/org/apache/paimon/view/ViewImpl.java

@@ -21,6 +21,8 @@
 import org.apache.paimon.catalog.Identifier;
 import org.apache.paimon.types.RowType;
 
+import org.apache.paimon.shade.jackson2.com.fasterxml.jackson.annotation.JsonIgnoreProperties;
+
 import javax.annotation.Nullable;
 
 import java.util.HashMap;
@@ -29,6 +31,7 @@
 import java.util.Optional;
 
 /** Implementation of {@link View}. */
+@JsonIgnoreProperties(ignoreUnknown = true)
 public class ViewImpl implements View {
 
     private final Identifier identifier;