[jira] [Created] (DRILL-799) cast bigint to decimal adds values after decimal points

["Chun Chang (JIRA)" <ji...@apache.org>]

Chun Chang created DRILL-799:
--------------------------------

             Summary: cast bigint to decimal adds values after decimal points
                 Key: DRILL-799
                 URL: https://issues.apache.org/jira/browse/DRILL-799
             Project: Apache Drill
          Issue Type: Bug
          Components: Functions - Drill
            Reporter: Chun Chang
            Assignee: Mehant Baid


tested use git.commit.id.abbrev=5d7e3d3

when casting bigint, we add values after decimal points:

0: jdbc:drill:schema=dfs> select c_bigint, cast(c_bigint as decimal(18,2)) from data where c_row = 9;
+------------+------------+
|  c_bigint  |   EXPR$1   |
+------------+------------+
| -4567890123456789 | -4567890123456789.12 |
+------------+------------+

0: jdbc:drill:schema=dfs> explain plan for select c_bigint, cast(c_bigint as decimal(18,2)) from data where c_row = 9;
+------------+------------+
|    text    |    json    |
+------------+------------+
| ScreenPrel
  ProjectPrel(c_bigint=[$2], EXPR$1=[CAST($2):DECIMAL(18, 2)])
    FilterPrel(condition=[=(CAST($1):INTEGER, 9)])
      ScanPrel(groupscan=[ParquetGroupScan [entries=[ReadEntryWithPath [path=maprfs:/user/root/mondrian/data]], selectionRoot=/user/root/mondrian/data, columns=[SchemaPath [`c_row`], SchemaPath [`c_bigint`]]]])
 | {
  "head" : {
    "version" : 1,
    "generator" : {
      "type" : "ExplainHandler",
      "info" : ""
    },
    "type" : "APACHE_DRILL_PHYSICAL",
    "options" : [ ],
    "resultMode" : "EXEC"
  },
  "graph" : [ {
    "pop" : "parquet-scan",
    "@id" : 1,
    "entries" : [ {
      "path" : "maprfs:/user/root/mondrian/data"
    } ],
    "storage" : {
      "type" : "file",
      "connection" : "maprfs:///",
      "workspaces" : {
        "default" : {
          "location" : "/user/root/mondrian/",
          "writable" : false,
          "storageformat" : null
        },
        "home" : {
          "location" : "/",
          "writable" : false,
          "storageformat" : null
        },
        "root" : {
          "location" : "/",
          "writable" : false,
          "storageformat" : null
        },
        "tmp" : {
          "location" : "/tmp",
          "writable" : true,
          "storageformat" : "csv"
        }
      },
      "formats" : {
        "psv" : {
          "type" : "text",
          "extensions" : [ "tbl" ],
          "delimiter" : "|"
        },
        "csv" : {
          "type" : "text",
          "extensions" : [ "csv" ],
          "delimiter" : ","
        },
        "tsv" : {
          "type" : "text",
          "extensions" : [ "tsv" ],
          "delimiter" : "\t"
        },
        "parquet" : {
          "type" : "parquet"
        },
        "json" : {
          "type" : "json"
        }
      }
    },
    "format" : {
      "type" : "parquet"
    },
    "columns" : [ "`c_row`", "`c_bigint`" ],
    "selectionRoot" : "/user/root/mondrian/data"
  }, {
    "pop" : "filter",
    "@id" : 2,
    "child" : 1,
    "expr" : "equal(cast( (`c_row` ) as INT ), 9) ",
    "initialAllocation" : 1000000,
    "maxAllocation" : 10000000000
  }, {
    "pop" : "project",
    "@id" : 3,
    "exprs" : [ {
      "ref" : "`c_bigint`",
      "expr" : "`c_bigint`"
    }, {
      "ref" : "`EXPR$1`",
      "expr" : "cast( (`c_bigint` ) as DECIMAL18(18, 2) )"
    } ],
    "child" : 2,
    "initialAllocation" : 1000000,
    "maxAllocation" : 10000000000
  }, {
    "pop" : "screen",
    "@id" : 4,
    "child" : 3,
    "initialAllocation" : 1000000,
    "maxAllocation" : 10000000000
  } ]
} |



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