本文整理了Java中org.apache.calcite.rel.RelNode.metadata方法的一些代码示例，展示了RelNode.metadata的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。RelNode.metadata方法的具体详情如下：
包路径：org.apache.calcite.rel.RelNode
类名称：RelNode
方法名：metadata

RelNode.metadata介绍

[英]Returns a metadata interface.
[中]返回元数据接口。

代码示例

代码示例来源：origin: Qihoo360/Quicksql

/**
 * Returns the
 * {@link BuiltInMetadata.Distribution#distribution()}
 * statistic.
 *
 * @param rel          the relational expression
 *
 * @return description of how the rows in the relational expression are
 * physically distributed
 */
public RelDistribution getDistribution(RelNode rel) {
 final BuiltInMetadata.Distribution metadata =
   rel.metadata(BuiltInMetadata.Distribution.class, this);
 return metadata.distribution();
}

代码示例来源：origin: org.apache.calcite/calcite-core

/**
 * Returns the
 * {@link BuiltInMetadata.Distribution#distribution()}
 * statistic.
 *
 * @param rel          the relational expression
 *
 * @return description of how the rows in the relational expression are
 * physically distributed
 */
public RelDistribution getDistribution(RelNode rel) {
 final BuiltInMetadata.Distribution metadata =
   rel.metadata(BuiltInMetadata.Distribution.class, this);
 return metadata.distribution();
}

代码示例来源：origin: Qihoo360/Quicksql

public String colType(RelMetadataQuery mq, RelNode rel, int column) {
 if (mq instanceof MyRelMetadataQuery) {
  return ((MyRelMetadataQuery) mq).colType(rel, column);
 } else {
  return rel.metadata(ColType.class, mq).getColType(column);
 }
}

代码示例来源：origin: org.apache.calcite/calcite-core

public String colType(RelMetadataQuery mq, RelNode rel, int column) {
 if (mq instanceof MyRelMetadataQuery) {
  return ((MyRelMetadataQuery) mq).colType(rel, column);
 } else {
  return rel.metadata(ColType.class, mq).getColType(column);
 }
}