Validates and adds a column to a table in schema.
Source
void addColumn(String tableName, SchemaColumn column, {String unencodedInitialValue}) { var table = schema.tableForName(tableName); if (table == null) { throw new SchemaException("Table $tableName does not exist."); } table.addColumn(column); if (store != null) { commands.addAll(store.addColumn(table, column, unencodedInitialValue: unencodedInitialValue)); } }