mirror of https://gitee.com/bigwinds/arangodb
51 lines
2.1 KiB
Plaintext
51 lines
2.1 KiB
Plaintext
arangosh> db._explain('FOR x IN 1..10 LET then=DATE_NOW() FOR y IN 1..10 LET now=DATE_NOW() LET nowstr=CONCAT(now, x, y, then) RETURN nowstr', {}, {colors: false})
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Query string:
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FOR x IN 1..10 LET then=DATE_NOW() FOR y IN 1..10 LET now=DATE_NOW() LET nowstr=CONCAT(now, x, y,
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then) RETURN nowstr
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Execution plan:
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Id NodeType Est. Comment
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1 SingletonNode 1 * ROOT
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2 CalculationNode 1 - LET #5 = 1 .. 10 /* range */ /* simple expression */
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3 EnumerateListNode 10 - FOR x IN #5 /* list iteration */
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4 CalculationNode 10 - LET then = DATE_NOW() /* simple expression */
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6 EnumerateListNode 100 - FOR y IN #5 /* list iteration */
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7 CalculationNode 100 - LET now = DATE_NOW() /* simple expression */
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8 CalculationNode 100 - LET nowstr = CONCAT(now, x, y, then) /* simple expression */
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9 ReturnNode 100 - RETURN nowstr
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Indexes used:
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none
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Optimization rules applied:
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Id RuleName
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1 move-calculations-up
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2 remove-redundant-calculations
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3 remove-unnecessary-calculations
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arangosh> db._explain('LET now=DATE_NOW() FOR x IN 1..10 FOR y IN 1..10 LET nowstr=CONCAT(now, x, y, now) RETURN nowstr', {}, {colors: false})
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Query string:
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LET now=DATE_NOW() FOR x IN 1..10 FOR y IN 1..10 LET nowstr=CONCAT(now, x, y, now) RETURN nowstr
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Execution plan:
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Id NodeType Est. Comment
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1 SingletonNode 1 * ROOT
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3 CalculationNode 1 - LET #4 = 1 .. 10 /* range */ /* simple expression */
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2 CalculationNode 1 - LET now = DATE_NOW() /* simple expression */
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4 EnumerateListNode 10 - FOR x IN #4 /* list iteration */
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6 EnumerateListNode 100 - FOR y IN #4 /* list iteration */
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7 CalculationNode 100 - LET nowstr = CONCAT(now, x, y, now) /* simple expression */
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8 ReturnNode 100 - RETURN nowstr
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Indexes used:
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none
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Optimization rules applied:
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Id RuleName
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1 move-calculations-up
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2 remove-redundant-calculations
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3 remove-unnecessary-calculations
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