Examples with GenericLiteral com.facebook.presto.sql.tree.GenericLiteral used on opensource projects

Example 6 with GenericLiteral

use of com.facebook.presto.sql.tree.GenericLiteral in project presto by prestodb.

the class GroupingOperationRewriter method rewriteGroupingOperation.

public static Expression rewriteGroupingOperation(GroupingOperation expression, List<Set<Integer>> groupingSets, Multimap<NodeRef<Expression>, FieldId> columnReferenceFields, Optional<VariableReferenceExpression> groupIdVariable) {
    requireNonNull(groupIdVariable, "groupIdVariable is null");
    // See SQL:2011:4.16.2 and SQL:2011:6.9.10.
    if (groupingSets.size() == 1) {
        return new LongLiteral("0");
    } else {
        checkState(groupIdVariable.isPresent(), "groupId symbol is missing");
        RelationId relationId = checkAndGetColumnReferenceField(expression.getGroupingColumns().get(0), columnReferenceFields).getRelationId();
        List<Integer> columns = expression.getGroupingColumns().stream().map(NodeRef::of).peek(groupingColumn -> checkState(columnReferenceFields.containsKey(groupingColumn), "the grouping column is not in the columnReferencesField map")).map(columnReferenceFields::get).flatMap(Collection::stream).map(fieldId -> translateFieldToInteger(fieldId, relationId)).collect(toImmutableList());
        List<Expression> groupingResults = groupingSets.stream().map(groupingSet -> String.valueOf(calculateGrouping(groupingSet, columns))).map(LongLiteral::new).collect(toImmutableList());
        // It is necessary to add a 1 to the groupId because the underlying array is indexed starting at 1
        return new SubscriptExpression(new ArrayConstructor(groupingResults), new ArithmeticBinaryExpression(ADD, createSymbolReference(groupIdVariable.get()), new GenericLiteral("BIGINT", "1")));
    }
}