Support 'OPTIONS' keyword in GPDB external table
In case user wanna specify parameters with OPTIONS other than config file in LOCATION, it provides flexible and friendly grammar. Usage: CREATE EXTERNAL TABLE xxx LOCATION xxx FORMAT xxx [OPTIONS ( [option_key 'option_value' [, ...]] )] xxx; Signed-off-by: NKuien Liu <kliu@pivotal.io> Signed-off-by: NPeifeng Qiu <pqiu@pivotal.io> Signed-off-by: NAdam Lee <ali@pivotal.io> Signed-off-by: NYuan Zhao <yuzhao@pivotal.io> Signed-off-by: NJesse Zhang <jzhang@pivotal.io>
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