import org.apache.calcite.plan.RelOptTable.ToRelContext; //导入依赖的package包/类
@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();
    }
  }
}
 

import org.apache.calcite.plan.RelOptTable.ToRelContext; //导入依赖的package包/类
@Override
public RelNode toRel(ToRelContext context, RelOptTable relOptTable) {
  ViewExpansionContext.ViewExpansionToken token = null;
  try {
    RelDataType rowType = relOptTable.getRowType();
    token = viewExpansionContext.reserveViewExpansionToken(viewOwner);
    SchemaPlus schemaPlus = token.getSchemaTree();
    return context.expandView(rowType, getView().getSql(), schemaPlus, getView().getWorkspaceSchemaPath(), null).rel;
  } finally {
    if (token != null) {
      token.release();
    }
  }
}
 

import org.apache.calcite.plan.RelOptTable.ToRelContext; //导入依赖的package包/类
@Override
public ScanCrel toRel(ToRelContext toRelContext, RelOptTable relOptTable) {
  return new ScanCrel(toRelContext.getCluster(), toRelContext.getCluster().traitSetOf(Convention.NONE), dataset.getStoragePluginId(), dataset, null, 1.0d, true);
}
 

import org.apache.calcite.plan.RelOptTable.ToRelContext; //导入依赖的package包/类
@Override
public RelNode toRel(ToRelContext toRelContext, RelOptTable relOptTable) {
  return new ConvertibleScan(toRelContext.getCluster(), toRelContext.getCluster().traitSet(), relOptTable, plugin,
      new ConversionContext.NamespaceConversionContext(schemaConfig.getAuthContext(), datasetConfig));
}
 

import org.apache.calcite.plan.RelOptTable.ToRelContext; //导入依赖的package包/类
@Override
public RelNode toRel(ToRelContext context, RelOptTable table) {
  return drillTable.toRel(context, table);
}
 

import org.apache.calcite.plan.RelOptTable.ToRelContext; //导入依赖的package包/类
@Override
public RelNode toRel(ToRelContext context, RelOptTable relOptTable) {
    int fieldCount = relOptTable.getRowType().getFieldCount();
    int[] fields = identityList(fieldCount);
    return new OLAPTableScan(context.getCluster(), relOptTable, this, fields);
}
 

import org.apache.calcite.plan.RelOptTable.ToRelContext; //导入依赖的package包/类
@Override public RelNode toRel(ToRelContext context, RelOptTable relOptTable) {
  final RelOptCluster cluster = context.getCluster();
  return new PigTableScan(cluster, cluster.traitSetOf(PigRel.CONVENTION), relOptTable);
}