Examples with PinotColumnHandle com.facebook.presto.pinot.PinotColumnHandle used on opensource projects

Example 6 with PinotColumnHandle

use of com.facebook.presto.pinot.PinotColumnHandle in project presto by prestodb.

the class PinotQueryGeneratorContext method toSqlQuery.

/**
 * Convert the current context to a Pinot SQL
 */
public PinotQueryGenerator.GeneratedPinotQuery toSqlQuery(PinotConfig pinotConfig, ConnectorSession session) {
    int nonAggregateShortQueryLimit = PinotSessionProperties.getNonAggregateLimitForBrokerQueries(session);
    boolean isQueryShort = (hasAggregation() || hasGroupBy()) || limit.orElse(Integer.MAX_VALUE) < nonAggregateShortQueryLimit;
    boolean forBroker = !PinotSessionProperties.isForbidBrokerQueries(session) && isQueryShort;
    String groupByExpressions = groupByColumns.stream().map(x -> selections.get(x).getDefinition()).collect(Collectors.joining(", "));
    String selectExpressions = outputs.stream().filter(o -> !groupByColumns.contains(o)).map(o -> updateSelection(selections.get(o).getDefinition(), session)).collect(Collectors.joining(", "));
    String expressions = (groupByExpressions.isEmpty()) ? selectExpressions : (selectExpressions.isEmpty()) ? groupByExpressions : groupByExpressions + ", " + selectExpressions;
    String tableName = from.orElseThrow(() -> new PinotException(PINOT_QUERY_GENERATOR_FAILURE, Optional.empty(), "Table name not encountered yet"));
    // Rules for limit:
    // - If its a selection query:
    // + given limit or configured limit
    // - Else if has group by:
    // + default limit or configured top limit
    // - Aggregation only query limit is ignored.
    // - Fail if limit is invalid
    int queryLimit = -1;
    if (!hasAggregation() && !hasGroupBy()) {
        if (!limit.isPresent() && forBroker) {
            throw new PinotException(PINOT_QUERY_GENERATOR_FAILURE, Optional.empty(), "Broker non aggregate queries have to have a limit");
        } else {
            queryLimit = limit.orElse(PinotSessionProperties.getLimitLargerForSegment(session));
        }
    } else if (hasGroupBy()) {
        if (limit.isPresent()) {
            queryLimit = limit.getAsInt();
        } else {
            queryLimit = PinotSessionProperties.getTopNLarge(session);
        }
    }
    String limitClause = "";
    if (queryLimit > 0) {
        limitClause = " LIMIT " + queryLimit;
    }
    String query = generatePinotQueryHelper(forBroker, expressions, tableName, limitClause);
    LinkedHashMap<VariableReferenceExpression, PinotColumnHandle> assignments = getAssignments(true);
    List<Integer> indices = getIndicesMappingFromPinotSchemaToPrestoSchema(query, assignments);
    return new PinotQueryGenerator.GeneratedPinotQuery(tableName, query, PinotQueryGenerator.PinotQueryFormat.SQL, indices, groupByColumns.size(), filter.isPresent(), isQueryShort);
}

Example 7 with PinotColumnHandle

use of com.facebook.presto.pinot.PinotColumnHandle in project presto by prestodb.

the class PinotQueryGeneratorContext method toPqlQuery.

/**
 * Convert the current context to a PQL
 */
public PinotQueryGenerator.GeneratedPinotQuery toPqlQuery(PinotConfig pinotConfig, ConnectorSession session) {
    int nonAggregateShortQueryLimit = PinotSessionProperties.getNonAggregateLimitForBrokerQueries(session);
    boolean isQueryShort = hasAggregation() || limit.orElse(Integer.MAX_VALUE) < nonAggregateShortQueryLimit;
    boolean forBroker = !PinotSessionProperties.isForbidBrokerQueries(session) && isQueryShort;
    if (!pinotConfig.isAllowMultipleAggregations() && aggregations > 1 && hasGroupBy()) {
        throw new PinotException(PINOT_QUERY_GENERATOR_FAILURE, Optional.empty(), "Multiple aggregates in the presence of group by is forbidden");
    }
    if (hasLimit() && aggregations > 1 && hasGroupBy()) {
        throw new PinotException(PINOT_QUERY_GENERATOR_FAILURE, Optional.empty(), "Multiple aggregates in the presence of group by and limit is forbidden");
    }
    String expressions = outputs.stream().filter(// remove the group by columns from the query as Pinot barfs if the group by column is an expression
    o -> !groupByColumns.contains(o)).map(o -> updateSelection(selections.get(o).getDefinition(), session)).collect(Collectors.joining(", "));
    if (expressions.isEmpty()) {
        throw new PinotException(PINOT_QUERY_GENERATOR_FAILURE, Optional.empty(), "Empty PQL expressions: " + toString());
    }
    String tableName = from.orElseThrow(() -> new PinotException(PINOT_QUERY_GENERATOR_FAILURE, Optional.empty(), "Table name not encountered yet"));
    // Rules for limit:
    // - If its a selection query:
    // + given limit or configured limit
    // - Else if has group by:
    // + ensure that only one aggregation
    // + default limit or configured top limit
    // - Fail if limit is invalid
    String limitKeyWord = "";
    int queryLimit = -1;
    if (!hasAggregation()) {
        if (!limit.isPresent() && forBroker) {
            throw new PinotException(PINOT_QUERY_GENERATOR_FAILURE, Optional.empty(), "Broker non aggregate queries have to have a limit");
        } else {
            queryLimit = limit.orElse(PinotSessionProperties.getLimitLargerForSegment(session));
        }
        limitKeyWord = "LIMIT";
    } else if (hasGroupBy()) {
        limitKeyWord = "TOP";
        if (limit.isPresent()) {
            if (aggregations > 1) {
                throw new PinotException(PINOT_QUERY_GENERATOR_FAILURE, Optional.of(generatePinotQueryHelper(forBroker, expressions, tableName, "")), "Pinot has weird semantics with group by and multiple aggregation functions and limits");
            } else {
                queryLimit = limit.getAsInt();
            }
        } else {
            queryLimit = PinotSessionProperties.getTopNLarge(session);
        }
    }
    String limitClause = "";
    if (!limitKeyWord.isEmpty()) {
        limitClause = " " + limitKeyWord + " " + queryLimit;
    }
    String query = generatePinotQueryHelper(forBroker, expressions, tableName, limitClause);
    LinkedHashMap<VariableReferenceExpression, PinotColumnHandle> assignments = getAssignments(false);
    List<Integer> indices = getIndicesMappingFromPinotSchemaToPrestoSchema(query, assignments);
    return new PinotQueryGenerator.GeneratedPinotQuery(tableName, query, PinotQueryGenerator.PinotQueryFormat.PQL, indices, groupByColumns.size(), filter.isPresent(), isQueryShort);
}

Example 8 with PinotColumnHandle

use of com.facebook.presto.pinot.PinotColumnHandle in project presto by prestodb.

the class PinotQueryGeneratorContext method getIndicesMappingFromPinotSchemaToPrestoSchema.

private List<Integer> getIndicesMappingFromPinotSchemaToPrestoSchema(String query, Map<VariableReferenceExpression, PinotColumnHandle> assignments) {
    LinkedHashMap<VariableReferenceExpression, Selection> expressionsInPinotOrder = new LinkedHashMap<>();
    for (VariableReferenceExpression groupByColumn : groupByColumns) {
        Selection groupByColumnDefinition = selections.get(groupByColumn);
        if (groupByColumnDefinition == null) {
            throw new IllegalStateException(format("Group By column (%s) definition not found in input selections: %s", groupByColumn, Joiner.on(",").withKeyValueSeparator(":").join(selections)));
        }
        expressionsInPinotOrder.put(groupByColumn, groupByColumnDefinition);
    }
    for (VariableReferenceExpression outputColumn : outputs) {
        Selection outputColumnDefinition = selections.get(outputColumn);
        if (outputColumnDefinition == null) {
            throw new IllegalStateException(format("Output column (%s) definition not found in input selections: %s", outputColumn, Joiner.on(",").withKeyValueSeparator(":").join(selections)));
        }
        expressionsInPinotOrder.put(outputColumn, outputColumnDefinition);
    }
    if (useSqlSyntax) {
        checkSupported(assignments.size() <= expressionsInPinotOrder.keySet().stream().filter(key -> !hiddenColumnSet.contains(key)).count(), "Expected returned expressions %s is a superset of selections %s", Joiner.on(",").withKeyValueSeparator(":").join(expressionsInPinotOrder), Joiner.on(",").withKeyValueSeparator("=").join(assignments));
    } else {
        checkSupported(assignments.size() == expressionsInPinotOrder.keySet().stream().filter(key -> !hiddenColumnSet.contains(key)).count(), "Expected returned expressions %s to match selections %s", Joiner.on(",").withKeyValueSeparator(":").join(expressionsInPinotOrder), Joiner.on(",").withKeyValueSeparator("=").join(assignments));
    }
    Map<VariableReferenceExpression, Integer> assignmentToIndex = new HashMap<>();
    Iterator<Map.Entry<VariableReferenceExpression, PinotColumnHandle>> assignmentsIterator = assignments.entrySet().iterator();
    for (int i = 0; i < assignments.size(); i++) {
        VariableReferenceExpression key = assignmentsIterator.next().getKey();
        Integer previous = assignmentToIndex.put(key, i);
        if (previous != null) {
            throw new PinotException(PINOT_UNSUPPORTED_EXPRESSION, Optional.of(query), format("Expected Pinot column handle %s to occur only once, but we have: %s", key, Joiner.on(",").withKeyValueSeparator("=").join(assignments)));
        }
    }
    ImmutableList.Builder<Integer> outputIndices = ImmutableList.builder();
    for (Map.Entry<VariableReferenceExpression, Selection> expression : expressionsInPinotOrder.entrySet()) {
        Integer index;
        if (hiddenColumnSet.contains(expression.getKey())) {
            // negative output index means to skip this value returned by pinot at query time
            index = -1;
        } else {
            index = assignmentToIndex.get(expression.getKey());
        }
        if (index == null) {
            if (useSqlSyntax) {
                // negative output index means to skip this value returned by pinot at query time
                index = -1;
            } else {
                throw new PinotException(PINOT_UNSUPPORTED_EXPRESSION, Optional.of(query), format("Expected to find a Pinot column handle for the expression %s, but we have %s", expression, Joiner.on(",").withKeyValueSeparator(":").join(assignmentToIndex)));
            }
        }
        outputIndices.add(index);
    }
    return outputIndices.build();
}