Examples with GbyVariableExpressionPair org.apache.asterix.lang.common.expression.GbyVariableExpressionPair used on opensource projects

Example 16 with GbyVariableExpressionPair

use of org.apache.asterix.lang.common.expression.GbyVariableExpressionPair in project asterixdb by apache.

the class SqlppGlobalAggregationSugarVisitor method visit.

@Override
public Expression visit(SelectBlock selectBlock, ILangExpression arg) throws CompilationException {
    SelectClause selectClause = selectBlock.getSelectClause();
    if (!selectBlock.hasGroupbyClause() && selectBlock.hasFromClause()) {
        boolean addImplicitGby;
        if (selectClause.selectRegular()) {
            addImplicitGby = isSql92Aggregate(selectClause.getSelectRegular(), selectBlock);
        } else {
            addImplicitGby = isSql92Aggregate(selectClause.getSelectElement(), selectBlock);
        }
        if (addImplicitGby) {
            // Adds an implicit group-by clause for SQL-92 global aggregate.
            List<GbyVariableExpressionPair> gbyPairList = new ArrayList<>();
            List<GbyVariableExpressionPair> decorPairList = new ArrayList<>();
            GroupbyClause gbyClause = new GroupbyClause(gbyPairList, decorPairList, new HashMap<>(), null, null, false, true);
            selectBlock.setGroupbyClause(gbyClause);
        }
    }
    return super.visit(selectBlock, arg);
}