Describe
Requesting a description of output parameters (columns) of a query is done using the statement information request message
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isc_info_sql_select
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isc_info_sql_describe_vars
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isc_info_sql_sqlda_seq
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isc_info_sql_type
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isc_info_sql_sub_type
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isc_info_sql_length
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isc_info_sql_scale
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isc_info_sql_field
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isc_info_sql_relation
The initial request can be done as part of [wireprotocol-statements-prepare].The information can be requested together with [wireprotocol-statements-describe-bind].