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Integrate Coral with Presto to enable querying hive views
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presto-hive/src/main/java/io/prestosql/plugin/hive/ViewReaderUtil.java
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| /* | ||
| * 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 io.prestosql.plugin.hive; | ||
|
|
||
| import com.linkedin.coral.hive.hive2rel.HiveMetastoreClient; | ||
| import com.linkedin.coral.hive.hive2rel.HiveToRelConverter; | ||
| import com.linkedin.coral.presto.rel2presto.RelToPrestoConverter; | ||
| import io.airlift.json.JsonCodec; | ||
| import io.airlift.json.JsonCodecFactory; | ||
| import io.airlift.json.ObjectMapperProvider; | ||
| import io.airlift.log.Logger; | ||
| import io.prestosql.plugin.base.CatalogName; | ||
| import io.prestosql.plugin.hive.authentication.HiveIdentity; | ||
| import io.prestosql.plugin.hive.metastore.CoralSemiTransactionalHiveMSCAdapter; | ||
| import io.prestosql.plugin.hive.metastore.SemiTransactionalHiveMetastore; | ||
| import io.prestosql.plugin.hive.metastore.Table; | ||
| import io.prestosql.spi.PrestoException; | ||
| import io.prestosql.spi.connector.ConnectorViewDefinition; | ||
| import io.prestosql.spi.connector.ConnectorViewDefinition.ViewColumn; | ||
| import io.prestosql.spi.type.TypeManager; | ||
| import org.apache.calcite.rel.RelNode; | ||
| import org.apache.calcite.rel.type.RelDataType; | ||
| import org.apache.hadoop.hive.metastore.TableType; | ||
|
|
||
| import java.util.Base64; | ||
| import java.util.List; | ||
| import java.util.Locale; | ||
| import java.util.Optional; | ||
|
|
||
| import static com.google.common.base.Verify.verify; | ||
| import static com.google.common.collect.ImmutableList.toImmutableList; | ||
| import static io.prestosql.plugin.hive.HiveErrorCode.HIVE_INVALID_VIEW_DATA; | ||
| import static io.prestosql.plugin.hive.HiveErrorCode.HIVE_VIEW_TRANSLATION_ERROR; | ||
| import static io.prestosql.plugin.hive.HiveMetadata.TABLE_COMMENT; | ||
| import static io.prestosql.plugin.hive.util.HiveUtil.checkCondition; | ||
| import static java.lang.String.format; | ||
| import static java.util.Objects.requireNonNull; | ||
| import static java.util.stream.Collectors.joining; | ||
| import static org.apache.hadoop.hive.metastore.TableType.VIRTUAL_VIEW; | ||
|
|
||
| public final class ViewReaderUtil | ||
| { | ||
| private ViewReaderUtil() | ||
| {} | ||
|
|
||
| public interface ViewReader | ||
| { | ||
| ConnectorViewDefinition decodeViewData(String viewData, Table table, CatalogName catalogName); | ||
| } | ||
|
|
||
| public static ViewReader createViewReader(SemiTransactionalHiveMetastore metastore, HiveIdentity identity, Table table, TypeManager typemanager) | ||
| { | ||
| if (isPrestoView(table)) { | ||
| return new PrestoViewReader(); | ||
| } | ||
| return new HiveViewReader(new CoralSemiTransactionalHiveMSCAdapter(metastore, identity), typemanager); | ||
| } | ||
|
|
||
| public static final String PRESTO_VIEW_FLAG = "presto_view"; | ||
| static final String VIEW_PREFIX = "/* Presto View: "; | ||
| static final String VIEW_SUFFIX = " */"; | ||
| private static final JsonCodec<ConnectorViewDefinition> VIEW_CODEC = | ||
| new JsonCodecFactory(new ObjectMapperProvider()).jsonCodec(ConnectorViewDefinition.class); | ||
| private static Logger log = Logger.get(io.prestosql.plugin.hive.ViewReaderUtil.class); | ||
|
|
||
| public static boolean isPrestoView(Table table) | ||
| { | ||
| return "true".equals(table.getParameters().get(PRESTO_VIEW_FLAG)); | ||
| } | ||
|
|
||
| public static boolean isHiveOrPrestoView(Table table) | ||
| { | ||
| return table.getTableType().equals(TableType.VIRTUAL_VIEW.name()); | ||
| } | ||
|
|
||
| public static boolean canDecodeView(Table table) | ||
| { | ||
| // we can decode Hive or Presto view | ||
| return table.getTableType().equals(VIRTUAL_VIEW.name()); | ||
| } | ||
|
|
||
| public static String encodeViewData(ConnectorViewDefinition definition) | ||
| { | ||
| byte[] bytes = VIEW_CODEC.toJsonBytes(definition); | ||
| String data = Base64.getEncoder().encodeToString(bytes); | ||
| return VIEW_PREFIX + data + VIEW_SUFFIX; | ||
| } | ||
|
|
||
| /** | ||
| * Supports decoding of Presto views | ||
| */ | ||
| public static class PrestoViewReader | ||
| implements ViewReader | ||
| { | ||
| @Override | ||
| public ConnectorViewDefinition decodeViewData(String viewData, Table table, CatalogName catalogName) | ||
| { | ||
| checkCondition(viewData.startsWith(VIEW_PREFIX), HIVE_INVALID_VIEW_DATA, "View data missing prefix: %s", viewData); | ||
| checkCondition(viewData.endsWith(VIEW_SUFFIX), HIVE_INVALID_VIEW_DATA, "View data missing suffix: %s", viewData); | ||
| viewData = viewData.substring(VIEW_PREFIX.length()); | ||
| viewData = viewData.substring(0, viewData.length() - VIEW_SUFFIX.length()); | ||
| byte[] bytes = Base64.getDecoder().decode(viewData); | ||
| return VIEW_CODEC.fromJson(bytes); | ||
| } | ||
| } | ||
|
|
||
| /** | ||
| * Class to decode Hive view definitions | ||
| */ | ||
| public static class HiveViewReader | ||
| implements ViewReader | ||
| { | ||
| private final HiveMetastoreClient metastoreClient; | ||
| private final TypeManager typeManager; | ||
|
|
||
| public HiveViewReader(HiveMetastoreClient hiveMetastoreClient, TypeManager typemanager) | ||
| { | ||
| this.metastoreClient = requireNonNull(hiveMetastoreClient, "metastoreClient is null"); | ||
| this.typeManager = requireNonNull(typemanager, "typeManager is null"); | ||
| } | ||
|
|
||
| @Override | ||
| public ConnectorViewDefinition decodeViewData(String viewSql, Table table, CatalogName catalogName) | ||
| { | ||
| try { | ||
| HiveToRelConverter hiveToRelConverter = HiveToRelConverter.create(metastoreClient); | ||
| RelNode rel = hiveToRelConverter.convertView(table.getDatabaseName(), table.getTableName()); | ||
| RelToPrestoConverter rel2Presto = new RelToPrestoConverter(); | ||
| String prestoSql = rel2Presto.convert(rel); | ||
| RelDataType rowType = rel.getRowType(); | ||
| List<ViewColumn> columns = rowType.getFieldList().stream() | ||
| .map(field -> new ViewColumn( | ||
| field.getName(), | ||
| typeManager.fromSqlType(getTypeString(field.getType())).getTypeId())) | ||
| .collect(toImmutableList()); | ||
| return new ConnectorViewDefinition(prestoSql, | ||
| Optional.of(catalogName.toString()), | ||
| Optional.of(table.getDatabaseName()), | ||
| columns, | ||
| Optional.ofNullable(table.getParameters().get(TABLE_COMMENT)), | ||
| Optional.empty(), | ||
| true); | ||
| } | ||
| catch (RuntimeException e) { | ||
| throw new PrestoException(HIVE_VIEW_TRANSLATION_ERROR, | ||
| format("Failed to translate Hive view '%s': %s", | ||
| table.getSchemaTableName(), | ||
| e.getMessage()), | ||
| e); | ||
| } | ||
| } | ||
|
|
||
| // Calcite does not provide correct type strings for non-primitive types. | ||
| // We add custom code here to make it work. Goal is for calcite/coral to handle this | ||
| private String getTypeString(RelDataType type) | ||
| { | ||
| switch (type.getSqlTypeName()) { | ||
| case ROW: { | ||
| verify(type.isStruct(), "expected ROW type to be a struct: %s", type); | ||
| return type.getFieldList().stream() | ||
| .map(field -> field.getName().toLowerCase(Locale.ENGLISH) + " " + getTypeString(field.getType())) | ||
| .collect(joining(",", "row(", ")")); | ||
| } | ||
| case CHAR: | ||
| return "varchar"; | ||
| case FLOAT: | ||
| return "real"; | ||
| case BINARY: | ||
| case VARBINARY: | ||
| return "varbinary"; | ||
| case MAP: { | ||
| RelDataType keyType = type.getKeyType(); | ||
| RelDataType valueType = type.getValueType(); | ||
| return format("map(%s,%s)", getTypeString(keyType), getTypeString(valueType)); | ||
| } | ||
| case ARRAY: { | ||
| return format("array(%s)", getTypeString(type.getComponentType())); | ||
| } | ||
| case DECIMAL: { | ||
| return format("decimal(%s,%s)", type.getPrecision(), type.getScale()); | ||
| } | ||
| default: | ||
| return type.getSqlTypeName().toString(); | ||
| } | ||
| } | ||
| } | ||
| } |
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