/**
* Returns ColumnSchema from TableSchema by column name.
*
* @param columnName column name
* @return ColumnSchema
*/
private ColumnSchema getColumnSchema(String columnName) {
TableSchema tableSchema = getTableSchema();
if (tableSchema == null) {
String message =
TableSchemaNotFoundException.createMessage(tableDesc.name(), dbSchema.name());
throw new TableSchemaNotFoundException(message);
}
ColumnSchema columnSchema = tableSchema.getColumnSchema(columnName);
if (columnSchema == null) {
String message = ColumnSchemaNotFoundException.createMessage(columnName, tableSchema.name());
throw new ColumnSchemaNotFoundException(message);
}
return columnSchema;
}
/**
* Returns TableSchema from dbSchema by table name.
*
* @return TableSchema
*/
private TableSchema getTableSchema() {
String tableName = tableDesc.name();
return dbSchema.getTableSchema(tableName);
}