import org.apache.drill.common.types.TypeProtos.MajorType; //導入方法依賴的package包/類

public void updateColumnMetaData(String catalogName, String schemaName,

String tableName, BatchSchema schema,

List> getObjectClasses ) {

final List newColumns =

new ArrayList(schema.getFieldCount());

for (int colOffset = 0; colOffset < schema.getFieldCount(); colOffset++) {

final MaterializedField field = schema.getColumn(colOffset);

Class> objectClass = getObjectClasses.get( colOffset );

final String columnName = field.getPath().getRootSegment().getPath();

final MajorType rpcDataType = field.getType();

final AvaticaType bundledSqlDataType = getAvaticaType(rpcDataType);

final String columnClassName = objectClass.getName();

final int nullability;

switch ( field.getDataMode() ) {

case OPTIONAL: nullability = ResultSetMetaData.columnNullable; break;

case REQUIRED: nullability = ResultSetMetaData.columnNoNulls; break;

// Should REPEATED still map to columnNoNulls? or to columnNullable?

case REPEATED: nullability = ResultSetMetaData.columnNoNulls; break;

default:

throw new AssertionError( "Unexpected new DataMode value '"

+ field.getDataMode().name() + "'" );

}

final boolean isSigned = Types.isJdbcSignedType( rpcDataType );

// TODO(DRILL-3355): TODO(DRILL-3356): When string lengths, precisions,

// interval kinds, etc., are available from RPC-level data, implement:

// - precision for ResultSetMetadata.getPrecision(...) (like

// getColumns()'s COLUMN_SIZE)

// - scale for getScale(...), and

// - and displaySize for getColumnDisplaySize(...).

final int precision =

rpcDataType.hasPrecision() ? rpcDataType.getPrecision() : 0;

final int scale = rpcDataType.hasScale() ? rpcDataType.getScale() : 0;

final int displaySize = 10;

ColumnMetaData col = new ColumnMetaData(

colOffset, // (zero-based ordinal (for Java arrays/lists).)

false, /* autoIncrement */

false, /* caseSensitive */

true, /* searchable */

false, /* currency */

nullability,

isSigned,

displaySize,

columnName, /* label */

columnName, /* columnName */

schemaName,

precision,

scale,

tableName,

catalogName,

bundledSqlDataType,

true, /* readOnly */

false, /* writable */

false, /* definitelyWritable */

columnClassName

);

newColumns.add(col);

}

columns = newColumns;

}

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