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DataFusionSchema.java
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package sqlancer.datafusion;
import static sqlancer.datafusion.DataFusionUtil.dfAssert;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;
import java.util.stream.Collectors;
import sqlancer.Randomly;
import sqlancer.SQLConnection;
import sqlancer.common.schema.AbstractRelationalTable;
import sqlancer.common.schema.AbstractSchema;
import sqlancer.common.schema.AbstractTable;
import sqlancer.common.schema.AbstractTableColumn;
import sqlancer.common.schema.TableIndex;
import sqlancer.datafusion.DataFusionProvider.DataFusionGlobalState;
import sqlancer.datafusion.DataFusionSchema.DataFusionTable;
import sqlancer.datafusion.ast.DataFusionConstant;
import sqlancer.datafusion.ast.DataFusionExpression;
public class DataFusionSchema extends AbstractSchema<DataFusionGlobalState, DataFusionTable> {
public DataFusionSchema(List<DataFusionTable> databaseTables) {
super(databaseTables);
}
// update existing tables in DB by query again
// (like `show tables;`)
public static DataFusionSchema fromConnection(SQLConnection con, String databaseName) throws SQLException {
List<DataFusionTable> databaseTables = new ArrayList<>();
List<String> tableNames = getTableNames(con);
for (String tableName : tableNames) {
List<DataFusionColumn> databaseColumns = getTableColumns(con, tableName);
boolean isView = tableName.startsWith("v");
DataFusionTable t = new DataFusionTable(tableName, databaseColumns, isView);
for (DataFusionColumn c : databaseColumns) {
c.setTable(t);
}
databaseTables.add(t);
}
return new DataFusionSchema(databaseTables);
}
private static List<String> getTableNames(SQLConnection con) throws SQLException {
List<String> tableNames = new ArrayList<>();
try (Statement s = con.createStatement()) {
try (ResultSet rs = s.executeQuery("select table_name " + "from information_schema.tables "
+ "where table_schema='public'" + "order by table_name; ")) {
while (rs.next()) {
tableNames.add(rs.getString(1));
}
}
}
return tableNames;
}
private static List<DataFusionColumn> getTableColumns(SQLConnection con, String tableName) throws SQLException {
List<DataFusionColumn> columns = new ArrayList<>();
try (Statement s = con.createStatement()) {
try (ResultSet rs = s.executeQuery(
String.format("select * from information_schema.columns where table_name = '%s';", tableName))) {
while (rs.next()) {
String columnName = rs.getString("column_name");
String dataType = rs.getString("data_type");
boolean isNullable = rs.getString("is_nullable").contentEquals("YES");
DataFusionColumn c = new DataFusionColumn(columnName,
DataFusionDataType.parseFromDataFusionCatalog(dataType), isNullable);
columns.add(c);
}
}
}
return columns;
}
/*
* When adding a new type: 1. Update all methods inside this enum 2. Update all `DataFusionBaseExpr`'s signature, if
* it can support new type (in `DataFusionBaseExprFactory.java`
*
* Types are 'SQL DataType' in DataFusion's documentation
* https://datafusion.apache.org/user-guide/sql/data_types.html
*/
public enum DataFusionDataType {
BIGINT, DOUBLE, BOOLEAN, NULL;
public static DataFusionDataType getRandomWithoutNull() {
DataFusionDataType dt;
do {
dt = Randomly.fromOptions(values());
} while (dt == DataFusionDataType.NULL);
return dt;
}
// How to parse type in DataFusion's catalog to `DataFusionDataType`
// As displayed in:
// create table t1(v1 int, v2 bigint);
// select table_name, column_name, data_type from information_schema.columns;
public static DataFusionDataType parseFromDataFusionCatalog(String typeString) {
switch (typeString) {
case "Int64":
return DataFusionDataType.BIGINT;
case "Float64":
return DataFusionDataType.DOUBLE;
case "Boolean":
return DataFusionDataType.BOOLEAN;
default:
dfAssert(false, "Unreachable. All branches should be eovered");
}
dfAssert(false, "Unreachable. All branches should be eovered");
return null;
}
// TODO(datafusion) lots of hack here, should build our own Randomly later
public DataFusionExpression getRandomConstant(DataFusionGlobalState state) {
if (Randomly.getBooleanWithSmallProbability()) {
return DataFusionConstant.createNullConstant();
}
switch (this) {
case BIGINT:
return DataFusionConstant.createIntConstant(state.getRandomly().getInteger());
case BOOLEAN:
return new DataFusionConstant.DataFusionBooleanConstant(Randomly.getBoolean());
case DOUBLE:
if (Randomly.getBoolean()) {
if (Randomly.getBoolean()) {
Double randomDouble = state.getRandomly().getDouble(); // [0.0, 1.0);
Double scaledDouble = (randomDouble - 0.5) * 2 * Double.MAX_VALUE;
return new DataFusionConstant.DataFusionDoubleConstant(scaledDouble);
}
String doubleStr = Randomly.fromOptions("'NaN'::Double", "'+Inf'::Double", "'-Inf'::Double", "-0.0",
"+0.0");
return new DataFusionConstant.DataFusionDoubleConstant(doubleStr);
}
return new DataFusionConstant.DataFusionDoubleConstant(state.getRandomly().getDouble());
case NULL:
return DataFusionConstant.createNullConstant();
default:
dfAssert(false, "Unreachable. All branches should be eovered");
}
dfAssert(false, "Unreachable. All branches should be eovered");
return DataFusionConstant.createNullConstant();
}
}
public static class DataFusionColumn extends AbstractTableColumn<DataFusionTable, DataFusionDataType> {
private final boolean isNullable;
public DataFusionColumn(String name, DataFusionDataType columnType, boolean isNullable) {
super(name, null, columnType);
this.isNullable = isNullable;
}
public boolean isNullable() {
return isNullable;
}
}
public static class DataFusionTable
extends AbstractRelationalTable<DataFusionColumn, TableIndex, DataFusionGlobalState> {
public DataFusionTable(String tableName, List<DataFusionColumn> columns, boolean isView) {
super(tableName, columns, Collections.emptyList(), isView);
}
public static List<DataFusionColumn> getAllColumns(List<DataFusionTable> tables) {
return tables.stream().map(AbstractTable::getColumns).flatMap(List::stream).collect(Collectors.toList());
}
public static List<DataFusionColumn> getRandomColumns(List<DataFusionTable> tables) {
if (Randomly.getBooleanWithRatherLowProbability()) {
return Arrays.asList(new DataFusionColumn("*", DataFusionDataType.NULL, true));
}
List<DataFusionColumn> allColumns = getAllColumns(tables);
return Randomly.nonEmptySubset(allColumns);
}
}
}