Cost-based subquery correlation and decorrelation
First Claim
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1. A method for processing a query, comprising:
- determining that the query includes at least one subquery that may be correlated or decorrelated; and
generating an internal representation of the query that represents the subquery in both correlated and decorrelated form, wherein the internal representation includes at least one virtual table.
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Abstract
Techniques are provided that determine that a query includes at least one subquery that may be correlated or decorrelated. An internal representation of the query that represents the subquery in both correlated and decorrelated form is generated, wherein the internal representation includes at least one virtual table.
27 Citations
30 Claims
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1. A method for processing a query, comprising:
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determining that the query includes at least one subquery that may be correlated or decorrelated; and
generating an internal representation of the query that represents the subquery in both correlated and decorrelated form, wherein the internal representation includes at least one virtual table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. An article of manufacture for processing a query, wherein the article of manufacture comprises a computer readable medium storing instructions, and wherein the article of manufacture is operable to:
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determine that the query includes at least one subquery that may be correlated or decorrelated; and
generate an internal representation of the query that represents the subquery in both correlated and decorrelated form, wherein the internal representation includes at least one virtual table. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A system for processing a query, comprising:
logic capable of causing operations to be performed, the operations comprising;
determining that the query includes at least one subquery that may be correlated or decorrelated; and
generating an internal representation of the query that represents the subquery in both correlated and decorrelated form, wherein the internal representation includes at least one virtual table. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
Specification