/** Creates a DrillScan. */
public DrillScanRel(
final RelOptCluster cluster, final RelTraitSet traits, final RelOptTable table) {
// By default, scan does not support project pushdown.
// Decision whether push projects into scan will be made solely in DrillPushProjIntoScanRule.
this(cluster, traits, table, table.getRowType(), GroupScan.ALL_COLUMNS);
this.settings = PrelUtil.getPlannerSettings(cluster.getPlanner());
}
@Override
public RelNode toRel(ToRelContext context, RelOptTable relOptTable) {
ViewExpansionContext.ViewExpansionToken token = null;
try {
RelDataType rowType = relOptTable.getRowType();
RelNode rel;
if (viewExpansionContext.isImpersonationEnabled()) {
token = viewExpansionContext.reserveViewExpansionToken(viewOwner);
rel =
context.expandView(
rowType, view.getSql(), token.getSchemaTree(), view.getWorkspaceSchemaPath());
} else {
rel = context.expandView(rowType, view.getSql(), view.getWorkspaceSchemaPath());
}
// If the View's field list is not "*", create a cast.
if (!view.isDynamic() && !view.hasStar()) {
rel = RelOptUtil.createCastRel(rel, rowType, true);
}
return rel;
} finally {
if (token != null) {
token.release();
}
}
}
public JdbcTableModify(
RelOptCluster cluster,
RelTraitSet traitSet,
RelOptTable table,
Prepare.CatalogReader catalogReader,
RelNode input,
Operation operation,
List<String> updateColumnList,
boolean flattened) {
super(cluster, traitSet, table, catalogReader, input, operation, updateColumnList, flattened);
assert input.getConvention() instanceof JdbcConvention;
assert getConvention() instanceof JdbcConvention;
final ModifiableTable modifiableTable = table.unwrap(ModifiableTable.class);
if (modifiableTable == null) {
throw new AssertionError(); // TODO: user error in validator
}
this.expression = table.getExpression(Queryable.class);
if (expression == null) {
throw new AssertionError(); // TODO: user error in validator
}
}
/**
* Converts a {@link SqlValidatorScope} into a {@link RelOptTable}. This is only possible if the
* scope represents an identifier, such as "sales.emp". Otherwise, returns null.
*
* @param namespace Namespace
* @param catalogReader Schema
* @param datasetName Name of sample dataset to substitute, or null to use the regular table
* @param usedDataset Output parameter which is set to true if a sample dataset is found; may be
* null
*/
public static RelOptTable getRelOptTable(
SqlValidatorNamespace namespace,
Prepare.CatalogReader catalogReader,
String datasetName,
boolean[] usedDataset) {
if (!namespace.isWrapperFor(TableNamespace.class)) {
return null;
}
final TableNamespace tableNamespace = namespace.unwrap(TableNamespace.class);
final List<String> names = tableNamespace.getTable().getQualifiedName();
RelOptTable table;
if (datasetName != null && catalogReader instanceof RelOptSchemaWithSampling) {
final RelOptSchemaWithSampling reader = (RelOptSchemaWithSampling) catalogReader;
table = reader.getTableForMember(names, datasetName, usedDataset);
} else {
// Schema does not support substitution. Ignore the data set, if any.
table = catalogReader.getTableForMember(names);
}
if (!tableNamespace.extendedFields.isEmpty()) {
table = table.extend(tableNamespace.extendedFields);
}
return table;
}
