presto-spi/src/main/java/io/prestosql/spi/connector/SchemaTableName.java/SchemaTableName/SchemaTableName
class SchemaTableName:    @JsonCreator
    public SchemaTableName(@JsonProperty("schema") String schemaName, @JsonProperty("table") String tableName)
    {
        this.schemaName = checkNotEmpty(schemaName, "schemaName").toLowerCase(ENGLISH);
        this.tableName = checkNotEmpty(tableName, "tableName").toLowerCase(ENGLISH);
    }