amogh-jahagirdar commented on code in PR #4657: URL: https://github.com/apache/iceberg/pull/4657#discussion_r883088054
########## core/src/main/java/org/apache/iceberg/view/BaseViewDefinition.java: ########## @@ -0,0 +1,197 @@ +/* + * 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.iceberg.view; + +import java.util.Collections; +import java.util.List; +import java.util.Objects; +import org.apache.iceberg.Schema; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; + +/** + * SQL definition for a view + */ +class BaseViewDefinition implements ViewDefinition { + private final String sql; + private final String dialect; + private final Schema schema; + private final String defaultCatalog; + private final List<String> defaultNamespace; + private final List<String> fieldAliases; + private final List<String> fieldComments; + + public static Builder builder() { + return new Builder(); + } + + public static Builder buildFrom(ViewDefinition that) { + return builder() + .sql(that.sql()) + .dialect(that.dialect()) + .schema(that.schema()) + .defaultCatalog(that.defaultCatalog()) + .defaultNamespace(that.defaultNamespace()) + .fieldAliases(that.fieldAliases()) + .fieldComments(that.fieldComments()); + } + + private BaseViewDefinition( + String sql, String dialect, Schema schema, String defaultCatalog, List<String> defaultNamespace, + List<String> fieldAliases, List<String> fieldComments) { + this.sql = Preconditions.checkNotNull(sql, "sql should not be null"); + this.dialect = Preconditions.checkNotNull(dialect, "dialect should not be null"); + this.schema = schema; + this.defaultCatalog = Preconditions.checkNotNull(defaultCatalog, "default catalog should not null"); + this.defaultNamespace = Preconditions.checkNotNull(defaultNamespace, "default namespace should not be null"); + this.fieldAliases = Preconditions.checkNotNull(fieldAliases, "field aliases should not be null"); + this.fieldComments = Preconditions.checkNotNull(fieldComments, "field comments should not be null"); + } + + @Override + public String sql() { + return sql; + } + + @Override + public String dialect() { + return dialect; + } + + @Override + public Schema schema() { + return schema; + } + + @Override + public String defaultCatalog() { + return defaultCatalog; + } + + @Override + public List<String> defaultNamespace() { + return defaultNamespace; + } + + @Override + public List<String> fieldAliases() { + return fieldAliases; + } + + @Override + public List<String> fieldComments() { + return fieldComments; + } + + @Override + public boolean equals(Object o) { + if (this == o) { + return true; + } + if (o == null || getClass() != o.getClass()) { + return false; + } + BaseViewDefinition that = (BaseViewDefinition) o; + return Objects.equals(sql, that.sql) && + Objects.equals(dialect, that.dialect) && + Objects.equals(schema.asStruct(), that.schema.asStruct()) && + Objects.equals(defaultCatalog, that.defaultCatalog) && + Objects.equals(defaultNamespace, that.defaultNamespace) && + Objects.equals(fieldAliases, that.fieldAliases) && + Objects.equals(fieldComments, that.fieldComments); + } + + @Override + public int hashCode() { + return Objects.hash(sql, dialect, schema.asStruct(), defaultCatalog, defaultNamespace, fieldAliases, fieldComments); + } + + @Override + public String toString() { + return "BaseViewDefinition{" + + "sql='" + sql + '\'' + + ", dialect=" + dialect + + ", schema=" + schema + + ", defaultCatalog='" + defaultCatalog + '\'' + + ", defaultNamespace=" + defaultNamespace + + ", fieldAliases=" + fieldAliases + + ", fieldComments=" + fieldComments + + '}'; + } + + public static final class Builder { + + private String sql; + private String dialect = ""; + private Schema schema = new Schema(); + private String defaultCatalog = ""; + private List<String> defaultNamespace = Collections.emptyList(); + private List<String> fieldAliases = Collections.emptyList(); + private List<String> fieldComments = Collections.emptyList(); + + private Builder() { + } + + public Builder sql(String value) { + sql = value; Review Comment: Just thinking out loud: If I'm not mistaken the spec basically lets the SQL be free form and with a dialect, an engine can do whatever parsing/analysis it needs to translate to its desires. However, certain aspects such as a view cannot reference itself (either directly or indirectly) seem universal across engines and it seems like we would want some layer of analysis within Iceberg to prevent that. In other words some semantic analysis should be baked into the spec. But I haven't fully thought this through, maybe there's something I'm missing. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
