/**
* Creates a JavaRelImplementor
*
* @param rexBuilder Builder for {@link RexNode}s
* @param implementorTable Table of implementations of operators. Must not be null
*/
public JavaRelImplementor(RexBuilder rexBuilder, OJRexImplementorTable implementorTable) {
super(rexBuilder);
Util.pre(rexBuilder != null, "rexBuilder != null");
Util.pre(implementorTable != null, "implementorTable != null");
this.implementorTable = implementorTable;
nextVariableId = 0;
}
public RelNode convertSqlToRel(String sql) {
Util.pre(sql != null, "sql != null");
final SqlNode sqlQuery;
try {
sqlQuery = parseQuery(sql);
} catch (Exception e) {
throw Util.newInternal(e); // todo: better handling
}
final RelDataTypeFactory typeFactory = getTypeFactory();
final Prepare.CatalogReader catalogReader = createCatalogReader(typeFactory);
final SqlValidator validator = createValidator(catalogReader, typeFactory);
final SqlToRelConverter converter =
createSqlToRelConverter(validator, catalogReader, typeFactory);
converter.setTrimUnusedFields(true);
final SqlNode validatedQuery = validator.validate(sqlQuery);
final RelNode rel = converter.convertQuery(validatedQuery, false, true);
Util.post(rel != null, "return != null");
return rel;
}