select: use column flags for dynamic column (#1098)
select: use column flags for dynamic column (#1098)

It needs to use GRN_OBJ_WEIGHT_FLOAT32
komainu8/groonga,groonga/groonga,kenhys/groonga,komainu8/groonga,groonga/groonga,kenhys/groonga,kenhys/groonga,kenhys/groonga,komainu8/groonga,komainu8/groonga,kenhys/groonga,komainu8/groonga,kenhys/groonga,komainu8/groonga,kenhys/groonga,groonga/groonga,komainu8/groonga,komainu8/groonga,groonga/groonga,kenhys/groonga,groonga/groonga,groonga/groonga,groonga/groonga,groonga/groonga