Package io.squashql.query.database

Class ClickHouseQueryEngine

java.lang.Object

io.squashql.query.database.AQueryEngine<ClickHouseDatastore>

io.squashql.query.database.ClickHouseQueryEngine

All Implemented Interfaces:

QueryEngine<ClickHouseDatastore>

public class ClickHouseQueryEngine
extends AQueryEngine<ClickHouseDatastore>

Field Summary

Fields

Modifier and Type	Field	Description
protected final com.clickhouse.client.ClickHouseNodes	nodes
static final List<String>	SUPPORTED_AGGREGATION_FUNCTIONS	aggregate functions NOTE: there is more but only a subset is proposed here.

Fields inherited from class io.squashql.query.database.AQueryEngine

datastore, fieldSupplier, queryRewriter

Fields inherited from interface io.squashql.query.database.QueryEngine

GRAND_TOTAL, TOTAL

Constructor Summary

Constructors

Constructor	Description
ClickHouseQueryEngine(ClickHouseDatastore datastore)

Method Summary

Modifier and Type	Method	Description
Table	executeRawSql(String sql)
static Object	getValue(com.clickhouse.data.ClickHouseRecord record, int index, List<com.clickhouse.data.ClickHouseColumn> columns)	Gets the value with the correct type.
protected Table	retrieveAggregates(DatabaseQuery query, String sql)
List<String>	supportedAggregationFunctions()

Methods inherited from class io.squashql.query.database.AQueryEngine

createFieldSupplier, createSqlStatement, datastore, execute, getFieldSupplier, postProcessDataset, queryRewriter, transformToColumnFormat, transformToRowFormat

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

SUPPORTED_AGGREGATION_FUNCTIONS

public static final List<String> SUPPORTED_AGGREGATION_FUNCTIONS

aggregate functions NOTE: there is more but only a subset is proposed here.

nodes

protected final com.clickhouse.client.ClickHouseNodes nodes

Constructor Details

ClickHouseQueryEngine

public ClickHouseQueryEngine(ClickHouseDatastore datastore)

Method Details

retrieveAggregates

protected Table retrieveAggregates(DatabaseQuery query,
 String sql)

Specified by:

retrieveAggregates in class AQueryEngine<ClickHouseDatastore>

executeRawSql

public Table executeRawSql(String sql)

getValue

public static Object getValue(com.clickhouse.data.ClickHouseRecord record,
 int index,
 List<com.clickhouse.data.ClickHouseColumn> columns)

Gets the value with the correct type. We can't directly call ClickHouseValue.asObject() because in some cases it could return an object from ClickHouse like a UnsignedLong. See com.clickhouse.data.value.ClickHouseLongValue$UnsignedLong.

supportedAggregationFunctions

public List<String> supportedAggregationFunctions()