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Add description for test hints
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@ -11,9 +11,35 @@
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namespace DB
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{
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/// Checks expected server and client error codes in testmode.
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/// To enable it add special comment after the query: "-- { serverError 60 }" or "-- { clientError 20 }".
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/// Also you can enable echoing all queries by writing "-- { echo }".
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/// Checks expected server and client error codes in --testmode.
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///
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/// The following comment hints are supported:
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///
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/// - "-- { serverError 60 }" -- in case of you are expecting server error.
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///
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/// - "-- { clientError 20 }" -- in case of you are expecting client error.
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///
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/// Remember that the client parse the query first (not the server), so for
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/// example if you are expecting syntax error, then you should use
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/// clientError not serverError.
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///
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/// Examples:
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///
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/// - echo 'select / -- { clientError 62 }' | clickhouse-client --testmode -nm
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///
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// Here the client parses the query but it is incorrect, so it expects
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/// SYNTAX_ERROR (62).
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///
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/// - echo 'select foo -- { serverError 47 }' | clickhouse-client --testmode -nm
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///
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/// But here the query is correct, but there is no such column "foo", so it
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/// is UNKNOWN_IDENTIFIER server error.
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///
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/// The following hints will control the query echo mode (i.e print each query):
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///
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/// - "-- { echo }"
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/// - "-- { echoOn }"
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/// - "-- { echoOff }"
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class TestHint
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{
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public:
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