28 lines
1.2 KiB
Ruby
28 lines
1.2 KiB
Ruby
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module Gitlab
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module Database
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module DateTime
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# Find the first of the `end_time_attrs` that isn't `NULL`. Subtract from it
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# the first of the `start_time_attrs` that isn't NULL. `SELECT` the resulting interval
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# along with an alias specified by the `as` parameter.
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#
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# Note: For MySQL, the interval is returned in seconds.
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# For PostgreSQL, the interval is returned as an INTERVAL type.
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def subtract_datetimes(query_so_far, end_time_attrs, start_time_attrs, as)
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diff_fn = if Gitlab::Database.postgresql?
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Arel::Nodes::Subtraction.new(
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Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(end_time_attrs)),
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Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(start_time_attrs)))
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elsif Gitlab::Database.mysql?
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Arel::Nodes::NamedFunction.new(
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"TIMESTAMPDIFF",
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[Arel.sql('second'),
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Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(start_time_attrs)),
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Arel::Nodes::NamedFunction.new("COALESCE", Array.wrap(end_time_attrs))])
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end
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query_so_far.project(diff_fn.as(as))
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end
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end
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end
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end
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