PREHOOK: query: EXPLAIn SELECT a, b FROM ( SELECT key a, value b FROM src ) src1 ORDER BY a LIMIT 1 PREHOOK: type: QUERY POSTHOOK: query: EXPLAIn SELECT a, b FROM ( SELECT key a, value b FROM src ) src1 ORDER BY a LIMIT 1 POSTHOOK: type: QUERY ABSTRACT SYNTAX TREE: (TOK_QUERY (TOK_FROM (TOK_SUBQUERY (TOK_QUERY (TOK_FROM (TOK_TABREF (TOK_TABNAME src))) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_TABLE_OR_COL key) a) (TOK_SELEXPR (TOK_TABLE_OR_COL value) b)))) src1)) (TOK_INSERT (TOK_DESTINATION (TOK_DIR TOK_TMP_FILE)) (TOK_SELECT (TOK_SELEXPR (TOK_TABLE_OR_COL a)) (TOK_SELEXPR (TOK_TABLE_OR_COL b))) (TOK_ORDERBY (TOK_TABSORTCOLNAMEASC (TOK_TABLE_OR_COL a))) (TOK_LIMIT 1))) STAGE DEPENDENCIES: Stage-1 is a root stage Stage-0 is a root stage STAGE PLANS: Stage: Stage-1 Map Reduce Alias -> Map Operator Tree: src1:src TableScan alias: src Select Operator expressions: expr: key type: string expr: value type: string outputColumnNames: _col0, _col1 Select Operator expressions: expr: _col0 type: string expr: _col1 type: string outputColumnNames: _col0, _col1 Reduce Output Operator key expressions: expr: _col0 type: string sort order: + tag: -1 value expressions: expr: _col0 type: string expr: _col1 type: string Reduce Operator Tree: Extract Limit File Output Operator compressed: false GlobalTableId: 0 table: input format: org.apache.hadoop.mapred.TextInputFormat output format: org.apache.hadoop.hive.ql.io.HiveIgnoreKeyTextOutputFormat Stage: Stage-0 Fetch Operator limit: 1 PREHOOK: query: SELECT a, b FROM ( SELECT key a, value b FROM src ) src1 ORDER BY a LIMIT 1 PREHOOK: type: QUERY PREHOOK: Input: default@src PREHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-04-31_466_7549947364806084065/-mr-10000 POSTHOOK: query: SELECT a, b FROM ( SELECT key a, value b FROM src ) src1 ORDER BY a LIMIT 1 POSTHOOK: type: QUERY POSTHOOK: Input: default@src POSTHOOK: Output: file:/tmp/sdong/hive_2011-02-10_17-04-31_466_7549947364806084065/-mr-10000 0 val_0