Examples with ExternalQueryOperation org.apache.flink.table.operations.ExternalQueryOperation used on opensource projects

Example 1 with ExternalQueryOperation

use of org.apache.flink.table.operations.ExternalQueryOperation in project flink by apache.

the class AbstractStreamTableEnvironmentImpl method fromStreamInternal.

protected <T> Table fromStreamInternal(DataStream<T> dataStream, @Nullable Schema schema, @Nullable String viewPath, ChangelogMode changelogMode) {
    Preconditions.checkNotNull(dataStream, "Data stream must not be null.");
    Preconditions.checkNotNull(changelogMode, "Changelog mode must not be null.");
    if (dataStream.getExecutionEnvironment() != executionEnvironment) {
        throw new ValidationException("The DataStream's StreamExecutionEnvironment must be identical to the one that " + "has been passed to the StreamTableEnvironment during instantiation.");
    }
    final CatalogManager catalogManager = getCatalogManager();
    final OperationTreeBuilder operationTreeBuilder = getOperationTreeBuilder();
    final SchemaTranslator.ConsumingResult schemaTranslationResult = SchemaTranslator.createConsumingResult(catalogManager.getDataTypeFactory(), dataStream.getType(), schema);
    final ResolvedCatalogTable resolvedCatalogTable = catalogManager.resolveCatalogTable(new ExternalCatalogTable(schemaTranslationResult.getSchema()));
    final ContextResolvedTable contextResolvedTable;
    if (viewPath != null) {
        UnresolvedIdentifier unresolvedIdentifier = getParser().parseIdentifier(viewPath);
        final ObjectIdentifier objectIdentifier = catalogManager.qualifyIdentifier(unresolvedIdentifier);
        contextResolvedTable = ContextResolvedTable.temporary(objectIdentifier, resolvedCatalogTable);
    } else {
        contextResolvedTable = ContextResolvedTable.anonymous("datastream_source", resolvedCatalogTable);
    }
    final QueryOperation scanOperation = new ExternalQueryOperation<>(contextResolvedTable, dataStream, schemaTranslationResult.getPhysicalDataType(), schemaTranslationResult.isTopLevelRecord(), changelogMode);
    final List<String> projections = schemaTranslationResult.getProjections();
    if (projections == null) {
        return createTable(scanOperation);
    }
    final QueryOperation projectOperation = operationTreeBuilder.project(projections.stream().map(ApiExpressionUtils::unresolvedRef).collect(Collectors.toList()), scanOperation);
    return createTable(projectOperation);
}