[rql2sql] when using HAVING to by-pass rql limitation (not to filter on result of an aggregat function), we should emit SQL that doesn't use HAVING to avoid potential backend error because variables are not grouped. Closes #1061603.
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# This file is part of CubicWeb.
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"""
"""
class Blog(EntityType):
title = String(maxsize=50, required=True)
description = String()
class BlogEntry(EntityType):
title = String(maxsize=100, required=True)
publish_date = Date(default='TODAY')
text = RichString(fulltextindexed=True)
category = String(vocabulary=('important','business'))
entry_of = SubjectRelation('Blog', cardinality='?*')