Impala query failed with error: “Incompatible Parquet Schema”

http://innovative-emotors.com/help-with-re-homework/ Help With Re Homework Yesterday, I was dealing with an issue that when running a very simple Impala SELECT query, it failed with “Incompatible Parquet schema” error. I have confirmed the following workflow that triggered the error:

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  1. Parquet file is created from external library
  2. Load the parquet file into Hive/Impala table
  3. Query the table through Impala will fail with below error message

    get incompatible Parquet schema for column 'db_name.tbl_name.col_name'. Column type: DECIMAL(19, 0), Parquet schema:\noptional byte_array col_name [i:2 d:1 r:0]

  4. The same query works well in Hive

http://teamlasolas.com/buy-a-dissertation-paper/ This is due to impala currently does not support all decimal specs that are supported by Parquet. Currently Parquet supports the following specs:

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  • int32: for 1 <= precision <= 9
  • int64: for 1 <= precision <= 18; precision < 10 will produce a warning
  • fixed_len_byte_array: precision is limited by the array size. Length n can store <= floor(log_10(2^(8*n - 1) - 1)) base-10 digits
  • binaryprecision is not limited, but is required. The minimum number of bytes to store the unscaled value should be used.

http://puravidashollow.com/homework-help-online-accounting/ homework help online accounting Please refer to Parquet Logical Type Definitions page for details.

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go site However, Impala only supports fixed_len_byte_array, but no others. This has been reported in the upstream JIRA: IMPALA-2494

get link

go site The only workaround for now is to create a parquet file that will use supported specs for Decimal column, or simply create parquet file through either Hive or Impala.

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