本文整理了Java中com.facebook.presto.metadata.Metadata.getColumnMetadata()方法的一些代码示例，展示了Metadata.getColumnMetadata()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。Metadata.getColumnMetadata()方法的具体详情如下：
包路径：com.facebook.presto.metadata.Metadata
类名称：Metadata
方法名：getColumnMetadata

Metadata.getColumnMetadata介绍

[英]Gets the metadata for the specified table column.
[中]获取指定表列的元数据。

代码示例

代码示例来源：origin: prestodb/presto

@Override
public Void visitTableScan(TableScanNode node, Void context)
{
  TableHandle tableHandle = node.getTable();
  Set<Column> columns = new HashSet<>();
  for (ColumnHandle columnHandle : node.getAssignments().values()) {
    columns.add(createColumn(metadata.getColumnMetadata(session, tableHandle, columnHandle)));
  }
  inputs.add(createInput(metadata.getTableMetadata(session, tableHandle), node.getLayout(), columns));
  return null;
}

代码示例来源：origin: prestodb/presto

@Override
public Void visitIndexSource(IndexSourceNode node, Void context)
{
  TableHandle tableHandle = node.getTableHandle();
  Set<Column> columns = new HashSet<>();
  for (ColumnHandle columnHandle : node.getAssignments().values()) {
    columns.add(createColumn(metadata.getColumnMetadata(session, tableHandle, columnHandle)));
  }
  inputs.add(createInput(metadata.getTableMetadata(session, tableHandle), node.getLayout(), columns));
  return null;
}

代码示例来源：origin: prestodb/presto

private Set<ColumnConstraint> parseConstraints(TableHandle tableHandle, TupleDomain<ColumnHandle> constraint)
{
  checkArgument(!constraint.isNone());
  ImmutableSet.Builder<ColumnConstraint> columnConstraints = ImmutableSet.builder();
  for (Map.Entry<ColumnHandle, Domain> entry : constraint.getDomains().get().entrySet()) {
    ColumnMetadata columnMetadata = metadata.getColumnMetadata(session, tableHandle, entry.getKey());
    columnConstraints.add(new ColumnConstraint(
        columnMetadata.getName(),
        columnMetadata.getType().getTypeSignature(),
        parseDomain(entry.getValue().simplify())));
  }
  return columnConstraints.build();
}

代码示例来源：origin: prestodb/presto

protected final List<Type> getColumnTypes(String tableName, String... columnNames)
{
  checkState(session.getCatalog().isPresent(), "catalog not set");
  checkState(session.getSchema().isPresent(), "schema not set");
  // look up the table
  Metadata metadata = localQueryRunner.getMetadata();
  QualifiedObjectName qualifiedTableName = new QualifiedObjectName(session.getCatalog().get(), session.getSchema().get(), tableName);
  TableHandle tableHandle = metadata.getTableHandle(session, qualifiedTableName)
      .orElseThrow(() -> new IllegalArgumentException(format("Table %s does not exist", qualifiedTableName)));
  Map<String, ColumnHandle> allColumnHandles = metadata.getColumnHandles(session, tableHandle);
  return Arrays.stream(columnNames)
      .map(allColumnHandles::get)
      .map(columnHandle -> metadata.getColumnMetadata(session, tableHandle, columnHandle).getType())
      .collect(toImmutableList());
}

代码示例来源：origin: prestodb/presto

Map<String, ColumnHandle> columnHandles = metadata.getColumnHandles(session, tableHandle);
List<ColumnHandle> visibleColumnHandles = columnHandles.values().stream()
    .filter(handle -> !metadata.getColumnMetadata(session, tableHandle, handle).isHidden())
    .collect(toImmutableList());
checkSpatialPartitioningTable(visibleColumnHandles.size() == 1, "Expected single column for table %s, but found %s columns", name, columnHandles.size());

代码示例来源：origin: prestodb/presto

for (Symbol symbol : inputs) {
  ColumnHandle column = tableScan.getAssignments().get(symbol);
  ColumnMetadata columnMetadata = metadata.getColumnMetadata(session, tableScan.getTable(), column);

代码示例来源：origin: prestodb/presto

if (metadata.getColumnMetadata(session, tableHandle, columnHandle).isHidden()) {
  throw new SemanticException(NOT_SUPPORTED, statement, "Cannot drop hidden column");

代码示例来源：origin: prestodb/presto

if (metadata.getColumnMetadata(session, tableHandle, columnHandle).isHidden()) {
  throw new SemanticException(NOT_SUPPORTED, statement, "Cannot rename hidden column");

代码示例来源：origin: prestodb/presto

TableHandle handle = analysis.getTableHandle(node.getTable());
ColumnHandle rowIdHandle = metadata.getUpdateRowIdColumnHandle(session, handle);
Type rowIdType = metadata.getColumnMetadata(session, handle, rowIdHandle).getType();

代码示例来源：origin: uk.co.nichesolutions.presto/presto-main

@Override
public Void visitIndexSource(IndexSourceNode node, Void context)
{
  TableHandle tableHandle = node.getTableHandle();
  Optional<ColumnHandle> sampleWeightColumn = metadata.getSampleWeightColumnHandle(session, tableHandle);
  Set<Column> columns = new HashSet<>();
  for (ColumnHandle columnHandle : node.getAssignments().values()) {
    if (!columnHandle.equals(sampleWeightColumn.orElse(null))) {
      columns.add(createColumnEntry(metadata.getColumnMetadata(session, tableHandle, columnHandle)));
    }
  }
  inputs.put(createTableEntry(metadata.getTableMetadata(session, tableHandle)), columns);
  return null;
}

代码示例来源：origin: uk.co.nichesolutions.presto/presto-main

@Override
public Void visitTableScan(TableScanNode node, Void context)
{
  TableHandle tableHandle = node.getTable();
  Optional<ColumnHandle> sampleWeightColumn = metadata.getSampleWeightColumnHandle(session, tableHandle);
  Set<Column> columns = new HashSet<>();
  for (ColumnHandle columnHandle : node.getAssignments().values()) {
    if (!columnHandle.equals(sampleWeightColumn.orElse(null))) {
      columns.add(createColumnEntry(metadata.getColumnMetadata(session, tableHandle, columnHandle)));
    }
  }
  inputs.put(createTableEntry(metadata.getTableMetadata(session, tableHandle)), columns);
  return null;
}

代码示例来源：origin: com.facebook.presto/presto-benchmark

protected final List<Type> getColumnTypes(String tableName, String... columnNames)
{
  checkState(session.getCatalog().isPresent(), "catalog not set");
  checkState(session.getSchema().isPresent(), "schema not set");
  // look up the table
  Metadata metadata = localQueryRunner.getMetadata();
  QualifiedObjectName qualifiedTableName = new QualifiedObjectName(session.getCatalog().get(), session.getSchema().get(), tableName);
  TableHandle tableHandle = metadata.getTableHandle(session, qualifiedTableName)
      .orElseThrow(() -> new IllegalArgumentException(format("Table %s does not exist", qualifiedTableName)));
  Map<String, ColumnHandle> allColumnHandles = metadata.getColumnHandles(session, tableHandle);
  return Arrays.stream(columnNames)
      .map(allColumnHandles::get)
      .map(columnHandle -> metadata.getColumnMetadata(session, tableHandle, columnHandle).getType())
      .collect(toImmutableList());
}

代码示例来源：origin: uk.co.nichesolutions.presto/presto-main

for (Symbol symbol : inputs) {
  ColumnHandle column = tableScan.getAssignments().get(symbol);
  ColumnMetadata columnMetadata = metadata.getColumnMetadata(session, tableScan.getTable(), column);

代码示例来源：origin: uk.co.nichesolutions.presto/presto-main

for (ColumnHandle columnHandle : columnHandles.keySet()) {
  try {
    ColumnMetadata columnMetadata = metadata.getColumnMetadata(session, tableHandle.get(), columnHandle);
    Signature operator = metadata.getFunctionRegistry().getCoercion(columnMetadata.getType(), VARCHAR);
    MethodHandle methodHandle = metadata.getFunctionRegistry().getScalarFunctionImplementation(operator).getMethodHandle();

代码示例来源：origin: uk.co.nichesolutions.presto/presto-main

TableHandle handle = analysis.getTableHandle(node.getTable());
ColumnHandle rowIdHandle = metadata.getUpdateRowIdColumnHandle(session, handle);
Type rowIdType = metadata.getColumnMetadata(session, handle, rowIdHandle).getType();

代码示例来源：origin: uk.co.nichesolutions.presto/presto-main

selectList.add(unaliasedName("partition_number"));
for (ColumnHandle columnHandle : partitionColumns) {
  ColumnMetadata column = metadata.getColumnMetadata(session, tableHandle.get(), columnHandle);
  Expression key = equal(nameReference("partition_key"), new StringLiteral(column.getName()));
  Expression value = caseWhen(key, nameReference("partition_value"));