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      Prefix

      Overview

      UQL support the following prefix keywords for a clause or the entire UQL statement:

      Prefix Keyword
      Description
      Scope
      TRY Used to create new graphsets, schemas and properties without returning an error message in case of failure. Successful creations are unaffected. If not using TRY, creation failure will return an error message, such as duplicated names. Current create() clause
      OPTIONAL Used to verify if each subquery within a query has returns. If a subquery finds no results, null values are returned in place of nodes and/or edges. If not using OPTIONAL, subquery with no results will have no return. Current query clause
      EXPLAIN Return the operation plan of the entire UQL statement without executing it. Entire UQL statement
      PROFILE Return the operation plan of the entire UQL statement and the time cost for each step during its execution. Entire UQL statement
      DEBUG Return the number of calls and time cost for each step in the operation plan of the entire UQL statement during its execution. Entire UQL statement
      EXEC TASK Send the entire UQL statement to the analytics node (algo node) of the cluster for execution Entire UQL statement

      Prefix keywords are all case insensitive.

      Examples

      EXPLAIN

      explain n({@movie} as movies).e({@filmedIn}).n({@country.name == "US"}) as paths  
      group by  movies.genre 
      return movies.genre, count(movies)
      

      PROFILE

      profile n({@movie} as movies).e({@filmedIn}).n({@country.name == "US"}) as paths  
      group by  movies.genre 
      return movies.genre, count(movies)
      

      DEBUG

      debug n({@movie} as movies).e({@filmedIn}).n({@country.name == "US"}) as paths  
      group by  movies.genre 
      return movies.genre, count(movies)
      
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