Examples with LogicalTypeMerging org.apache.flink.table.types.logical.utils.LogicalTypeMerging used on opensource projects

Example 1 with LogicalTypeMerging

use of org.apache.flink.table.types.logical.utils.LogicalTypeMerging in project flink by apache.

the class ValuesOperationFactory method create.

/**
 * Creates a valid {@link ValuesQueryOperation} operation.
 *
 * <p>It derives a row type based on {@link LogicalTypeMerging}. It flattens any row
 * constructors. It does not flatten ROWs which are a result of e.g. a function call.
 *
 * <p>The resulting schema can be provided manually. If it is not, the schema will be
 * automatically derived from the types of the expressions.
 */
QueryOperation create(@Nullable ResolvedSchema expectedSchema, List<ResolvedExpression> resolvedExpressions, ExpressionResolver.PostResolverFactory postResolverFactory) {
    List<List<ResolvedExpression>> resolvedRows = unwrapFromRowConstructor(resolvedExpressions);
    if (expectedSchema != null) {
        verifyAllSameSize(resolvedRows, expectedSchema.getColumnCount());
    }
    ResolvedSchema schema = Optional.ofNullable(expectedSchema).orElseGet(() -> extractSchema(resolvedRows));
    List<List<ResolvedExpression>> castedExpressions = resolvedRows.stream().map(row -> convertTopLevelExpressionToExpectedRowType(postResolverFactory, schema.getColumnDataTypes(), row)).collect(Collectors.toList());
    return new ValuesQueryOperation(castedExpressions, schema);
}